Tachometer Needle Jumping

All of our new, rebuilt, and used parts come with a 1 year warranty. I have a msd 6A hooked to a HEI distrubutor with a autometer tach. Output shaft 2nd gear, output shaft 5th or high gear, and the shift fork that engages them The "dogs" on the high gear engage in the 2nd gear "slots" to turn the shaft. The fluctuating tach on warm up is normal. Re: Tachometer Needle Jumps Thanks for the explanation, just for curiosity I put to old recifier back on and connected the tach lead to the other stator lead and the tach is fine there. My gauge issues started after an off-road trip on 1-30-11, pulling into my driveway. The car runs great and no more points maintenance will be needed. Only when i speed up, slow down, and/or reach level ground will it stop. This can happen on acceleration or deceleration. It is Intermittantly having a problem, the engine will start idleing high, and the speedometer, and tach will start jumping around, This usually happens at idle, at a stop or in park. View our themes on sultantheme. I've been running Autometer phantom gauges in my 78 for a while now. After engin off tach vibrates? S-Series Tech. ) and speed (HG/H+ contacts), so my guess would be that the RPM signal makes it through onto the PCB and the positioning coil of the tach needle has a short. Yabba Dabba DO NOW IS WHERE THE PROBLEM STARTS. The Tach signal for an HEI is reasonably similar to that found in a normal points ignition, with the exception of the dwell period duty cycle. I sent the whole instrument cluster off to Palo Alto Speedometer for refurbishment. Speedometer Jumps to 20mph at Idle. The Fix: The basic problem appears to be the material that the speedo electronics board is made from. My lude now seems faster and more powerful and it idles smoother also. i tested a good unmolested stock tach and at 3,000 rpm it was off by 250-300 revolutions. My 10 year old Zilla based conversion is having a problem. Long story short I purchased 2 new CDI's right away for my project with no faith that the one that came with the bike actually works. Here is a solution for my problem. Overview - There are many manuals and resources that offer tuning info for Mikuni “Round-slide” carbs, but most lack “real world” explanations of how to do the proper preparation along with that tuning. This can happen on acceleration or deceleration. When the engine starts and runs, the needle will move just like it should (rev up, drop when shifts, hold steady at cruise), but it may read 7000 rpm! The next time I start the engine, it will be somewhere else on the dial. The needle hesitates a lot. I purchased a 1994 Peterbilt 377 a few months ago and the Speedometer (and tripometer/odometer) & the Tachometer have never worked. Q - Does turning your headlights on/off also make your tach needle jump? I will assume it does. if you need to send your tach to us for repair, you can remove the male and female banana plugs from your tach leads and jumper them together. This section is packed with quick reference material for the Paramedic in the Field. I have started to experience sporadic needle jumping when I pass 2k rpms and the frequency increases as the rpms go up. I believe this is the "Ticking Needle" which is a fairly common issue. When the car is idling the tach needle bounces. Tranny was rebuilt and everything was fine for about 2,000 miles. Aug 21, 2019- Explore charpo123's board "punch needle", followed by 302 people on Pinterest. I have recently purchased a new 2013 Jetta TDI manual. see deals now!. Aug 21, 2019- Explore charpo123's board "punch needle", followed by 302 people on Pinterest. I noticed that my tachometer needle is jumping around frantically. To diagnose if the random tachometer needle movement is caused by AFM transition, shift the transmission to manual mode (M), select 5th gear (M5) and drive the vehicle under the same conditions. BUDS & CANDoo Pro software & tools. I first noticed it immediately after launching the Mac last year for the summer. Hello everyone Im new on your site and I have a little problem with my skoda octavia I have problems with the tachometer needle fluctuation I changed the throttle with one second and nothing has changed. You need to check this with a multimeter, preferrably an analog one, while the tach needle is bouncing. when i went to leave my friends house i started the bike the tach went through the usual motions when i first turned. My 150cc Chinese scooter has a speedometer, oddometer, tachometer and a fuel gauge. Like here in Okla. The car runs great and drives great. It takes a signal from the engine computer and converts it to a signal which drives the tach, which is basically an analog type meter (magnet and coil driving the needle). Dynojet makes a kit with an adjustable needle and several main jets. I have an 04 rev. I put a digital cat tach like that in mine there is a dial in the back with 1-10 on it I thank you got to. IF the second tach is not correctly indicating, either the cable is bad on one end or the drive gear at the engine is bad. At first pls ground directly to the negative pole of the battery. 5k too high. Check the main wiring connection to the tachometer and speedometer. Guess I could hook up a V/O meter and see which pin causes the needle to run up/down the scale while hitting the throttle. I have a 1990 2. I found a lot of tach’s for under $100 but most of the reviews complained about the needle jumping a lot. The stock tach needle has started bouncing all over the place. Does the tachometer needle on your 1968-’74 bounce and not give a steady reading? Does your tachometer just not function? The tachometers on these Corvettes are cable driven from the distributor. Some ignition systems are electronically noisier than others. I had about the same symptoms on my tach, the needle was jumping, especially when accelerating. The symptoms of tachometer problems are: a sticking needle, the tach will not register above a certain rpm, sometimes the tach works correctly and sometimes it doesn't, the needle does not return to zero when the ignition is turned on, the needle jumps radically or fluctuates, or the tach just does not work at all. When I click the Load Light Switch, the Tachometer Needle jumps a little. The needle now acts completely normal, other than being 500rpm off. I seems to me like when we used the tractor last fall the tach would work but wouldn't be right. With high accuracy readings, Sport Line auto equipment presents the fastest 2” electrical oil & mechanical boost gauges designed to match modern car interiors. Well after a little bit of TLC the Bike starts right up and appears to be running on both Cylinders (both pipes get hot)but I have no Tachometer. When it is idling, the speedo needle jumps from from 0 to 120. I had one tach that would return all the way home when cranked over to 8k, but when cranked to the 4k mark, it would hang up at around 3k. Remove the tach from the dash and apply 12 volts and ground, tach needle should go to zero if working. Rated 1 out of 5 by Herring Problem from Tach -fails to read rpm This tack was installed by a certified tech for me. Then [the tachometer reading] returns to normal. When you say the tach jumps, do you mean just the tach or does the engine actually rev with it? If so I would imagine it could be a slipping clutch. Is it a bad tach or could it be something else?. There are several common causes for a speedometer to stop working. I have a new wrinkle to throw into the jumpy tachometer needle. As mentioned on another thread, my tach is suffering a needle jump at low RPMs. Took it to a shop and they pulled the fairing and tightened all the ground connections and checked all the wiring but the problem returned after a few days. If my tach matches the boats tach, and jumps all over the place as well, I know the problem is in the wiring in the boat. when i slap (gently LOL) the top of dashboard show me the c. I just recently had a very similar problem. Accessibility Help. You need to check this with a multimeter, preferrably an analog one, while the tach needle is bouncing. Well when I start the engine cold, the engine sputters, the rpm needle jumps up and down, then after a while the engine starts to get normal when she is getting hot. I cracked the cosmetic housing also, any bright ideas on where to get one of those too? I found a site to buy it new for $70, obviously prefer to get it cheeper. I have a 5 Inch autometer Tach and when I cruise down the freeway at steady speeds 60, 65 mph the Tach needle starts jumping from 2500 to 3300 back and forth. ELECTRONICS INTERNATIONAL R-1 RPM TACHOMETER These Digital/Graphic Instruments are solid state and hold their accuracy over time and a range of environmental conditions. I called Uma support and told me to check all wires connections (Idid 4 times just to be sure its ok) and also to check ac voltage from the RPM pick coil unit. engine conditioning might be an issue , without actually doing tests on the truck you will get so many answers that will not help you out. For those with a technical bent, this includes the GMT800, K20, GM360, and GMX380. My gauge issues started after an off-road trip on 1-30-11, pulling into my driveway. Purchased an aftermarket tach and pod for a roof column installation. Vdo speedometer troubleshooting. After about 20 minute drive and pushy the tach to 5,500 rpm, the tach needle started its dance againjumping up to 6,000 RPM and then going deadthen to an accurate reading. Honda Marine - 4-stroke outboard motors from 2 to 250 hp. MG MGB Technical erratic gauges BBS discussion. BUTwhen at full throtttle or when revving with no engine load, the needle is steady and accurate. Wirespokes will know, I reckon. Basically when I am at 2500 and gas it the needle just bounces around and cannot tell what rpm I am at. Fixes for 12V Signal Style Tachometers If your tachometer needle is bouncing or reading too high: Problems with Early 12V Signal Style Tachometers If your tachometer needle is bouncing or reading too high: If the car's tachometer RPM reading is too high when the engine is running, or the tachometer works OK to a certain RPM,. It started at jsut slower speeds but has become noticeable at all speeds. The speed drops about 20 mph approx, then jumps right back. Why tachometer needle jumps up and down? A cars tach jumps and runs with engine rpm. A frozen needle will not move. However, if you feel that this is not right, get the vehicle into the dealership. My gauge issues started after an off-road trip on 1-30-11, pulling into my driveway. Well when I start the engine cold, the engine sputters, the rpm needle jumps up and down, then after a while the engine starts to get normal when she is getting hot. In the past couple days I've noticed the tach needle bouncing every so often. 4l tonight for the first time it threw a check engine light, so I checked the codes. Can anyone tell me where I may find the Tachometer sensor or have any ideas on where to check for a tach. This gauge has a silver face, silver bezel, orange needle, and black numbers, letters and markings. The more I rev up and down, the less sticky the tach become. I'm having some weird issues with the tachometer and temp gauge on my Interceptor. When I took out the key from the ignition, my speedometer and tachometer needle started making ticking noises, and I realized they were actually shaking. I took it in and my dealer reflashed the ECM, which cured it for a while. My tachometer will literally bounce up and down between 2000-3000 rpm while i am driving up a hill at an average speed of 60 mph with my cruise set or not. To diagnose if the random tachometer needle movement is caused by AFM transition, shift the transmission to manual mode (M), select 5th gear (M5) and drive the vehicle under the same conditions. 3) Start the car and after it settles into a regular idle notice where the needle is on the tachometer. 1991 Mustang LX erratic tach needle 5. If it opens to ground, it may disable the tach. I have recently purchased a new 2013 Jetta TDI manual. When the needle is at the accurate read, I tried the directionals again and it cuased the same small bump in the needle with each tick. Find outboard engine specs, special financing, accessories, and Honda Outboard Motor dealers near you. Tach needle jumps, engine stalls. My Neon w/ 41TE tranny does this too. While idling, either in park or with my foot on the break my speedometer jumps like i'm going between 10-20MPH. You may have a worn cable or worn Tach socket. Inconsistent readings or jumping needle: The tach needle bounces up and down instead of holding steady. This doesn't happen all the time, but only every so often. the engine will run with the tach out of the circuit while it is being serviced. This is first a lubrication issue. If the speedometer doesn't work at all then there could be two causes. The indicator needles on the tachometer and speedometer often break off. if your tach is completely dead you can replace this chip with the NTE01670 as the LM181 is no longer manufactured. pk with over 10,000 Car auto parts variety. Hope yours turns out to just be a lubrication. It started acting up this spring as we were heading back to the dock one afternoon. have changed the entire wire system and still problem persists. He said they take your faceplate and needle and install them onto brand new gauges and you get a 3 year warranty on that gauge, this is $100 per gauge. When I tried to start it, only the airbag symbol in the bottom left corner of the instrument panel came on. If the tach reads Zero, the problem is in the distributor or the wire coming from the distributor. All of a sudden, the speedometer needle starts jumping around and the engine starts to cut out. Instrument Panel problems of the 2005 Chevrolet Silverado 21 problems related to instrument panel have been reported for the 2005 Chevrolet Silverado. I have started to experience sporadic needle jumping when I pass 2k rpms and the frequency increases as the rpms go up. Re: John Deere 750 crazy tach question / alternator- voltage reg possible cause? Since the tach is a mechanical drive, not much chance the electrical has anything to do with it. When it is idling, the speedo needle jumps from from 0 to 120. I cannot seem to figure out why my tach needle jumps all around. After freeing the tach needle I soaked the electrical connectors with contact cleaner hoping to clean up any poor connections, but the problem didn't go away. If the cycling is a internal overload in the charger that is tripping, the culprit could be the charger itself, a shorted cell or plate in the battery or a short in the charging system. Can someone tell me what's causing the needle to jump around and what to do to fix it? Thanks. My Neon w/ 41TE tranny does this too. My problem is that my tach is 100% accurate even after I tried to adjust it on the back. Fixed a bouncing #tachometer needle yesterday. I will be riding along and it appears to be giving an accurate reading, when out of nowhere it jumps in the redline and then starts bouncing all over the place. When I start the car the rpm needle will jump up to like 2 or 3 and makes a weird sound then comes back to 1. If it shorts the coil, it may diable the tach (and burn up the coil). The small "bracket" on top of the ball (which is supposed to press the ball and then the plate steady down) was simply not tightened properly. Common advice about getting under the tachometer or speedo glass is to hacksaw or Dremmel the bezel off. It seems to especially start up when i whamp on the engine or accelerate fast when i start out. If you do this, watch out for that prop. It also appears the tach is not accurate over 3000 rpm's. The speedo cable for those old cars is like a spring. The tach normally should read between 2-3k RPM. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon. International Tractor Parts 806 - Gauges. Best of all, our CJ speedometers use GPS technology, require no calibration, and you'll never have to worry about broken speedometer cables again. - Harley Davidson 2000 XL 1200 C Sportster question. The engine continues to run, but not as good as before and the check engine light stays on. I have a 1984 Subaru gl with 4 speed. The original tach did this and so does the new Stewart Warner tach that I replaced it with. 2007 Corolla - Jumpy Tach and C. I dont notice any slip in clutch and cannot figure out why it jumps, but sometimes when it jumps during cruise control it will actually shut off my cruise control. BUTwhen at full throtttle or when revving with no engine load, the needle is steady and accurate. Haven't really noticed it with the Caravan but I'll pay closer attention next time I get to drive "the wife's" car. The tachometer needle does not require a stop pin at zero. The tach needs to receive a pulsed signal, so connecting to a direct current won't make the needle move. I read online it can be sticky cable, or sticky gears. Many installations will work but some will produce erratic or no movement of the indicating needle. Also make sure it is lubed. The car runs good,idles good but the tachometer is very jumpy. ran the 2 ground wires to the frame and wired back light to hot acc. Use big twists to get the needle to go all the way over but also use smaller ones to get the needle to only go part of the way. I fixed the leaks, and the jumping stopped. This started after putting in a new battery and trickle charging it. It did it for a few hours until the tach frooze and broke the cable. I drill could only get it up to 3000 rpm's, but it was jumping around around. You do want to see the tach at night right. Everytime i step on accelerate on the gas pedal, i look at the RPM dial and the needle jumps to 3, then the car has these slight jerks and as it jerks, the needle drops from 3 to 2. All very inconsistent. this is the other chip that is completely black. My tach needle jumps around after 2500 rpm. Would think the RPM connector should go directly to the ECU, don't have wiring diagrams. The tach needle was jumping becuase of a loose/bad connection were the MAF-T splices into the tach wire at the intake manifold. (around 850/900 rpm) 4) Bridge the TEN and GND cells 5) You should notice the idle speed change after a few seconds. I have the 6,000 rpm Screamin Eagle ECM, but it ran fine for years, and now just all of a sudden. I began recently noticing while driving at a steady higher speed (Interstate the most obvious) the RPM's will surge to 2500 to 4000 for very short and intermittent periods (5-10 seconds) and then return to it's normal RPM. Well when I start the engine cold, the engine sputters, the rpm needle jumps up and down, then after a while the engine starts to get normal when she is getting hot. Have the torque converter and tranny flushed. Say you saw it here and receive $20 off of our regular repair price. When out for a ride yesterday my tach. it bounced up and down between 40 and off the scale. If im shifting hard and really getting the most out of my engine only taking it to like 3 rpm it will go all over the place then stop working and the needle stays at 0 mph. I put a Baron aftermarket tachometer on my dual fire 03 Husky and am having a problem with the needle bouncing at all RPM's. If it turns out that the cable is not broken, then the drive on the front of the engine would be broke although I don't recall ever seeing one of these fail. However, there is an issue with the tachometer and speedometer. Now that we know what it's doing, we know which direction to dig to find and correct the cause. Another on does not respond but remains at zero. All of our new, rebuilt, and used parts come with a 1 year warranty. Tach needle at 0 RPMs when the car is idling and not under load; Tach needle consistently reading >500 RPMs under the actual engine speed (I know by experience with the car and the sound of the engine) Tach needle jumping back and forth wildly between readings (e. (Digifant: If needle doesn't move, jump the yellow/red wire terminal to ground, cooling system, Incorrect ignition and/or valve timing, Electric cooling fan not switching on Cabriolets use 1540 speedometers, whether it's a VDO or Motometer. At highway speeds, it almost never happens, the cruise control works, but will cut out maybe once and hour. Tachometer needle sticks, jumps, or pegs; Fuel gauge flutters; Entire instrument panel fails; The common cause for all these issues is a faulty stepper motor (XC5. The tachometer sensor may fail; if the tachometer needle jumps around and the transmission has harsh shifts or does not upshift, this sensor should be checked. When I start the car the rpm needle will jump up to like 2 or 3 and makes a weird sound then comes back to 1. Since the car drives okay, I'd concentrate on either the tach signal to the gauges or the grounds for the gauges. I sent the whole instrument cluster off to Palo Alto Speedometer for refurbishment. Followers 1. It jumps around and generally shows a much higher reading than what the engine rpm is. Hi, I just wantend to know if anyone has this problem and if there is a fix to it. 5k When I start the bike the tach goes to 3. My tachometer has started giving erratic readings. malfunction. Also, anyone ever had their tach needle go crazy? Sometimes reads 0 rpms at idle then jumps back up to normal. That noise went away after a while, then came back, then went away again. The car runs good,idles good but the tachometer is very jumpy. The motor was used throughout General Motor’s entire production line from 2003 to 2007. Designed in the days of contact breakers, they give inconsistent results when used with electronic ignitions. After engin off tach vibrates? S-Series Tech. Started acting like previous owners said ie speedo jumping, tach reading erratic due to tranny shifting up and down and poor mileage. Sometimes the tach works properly other times it almost spins around to the tach-stop. The gauge is a Faria model TC9951 that also has the 4 system check lights on it. I have a 5 Inch autometer Tach and when I cruise down the freeway at steady speeds 60, 65 mph the Tach needle starts jumping from 2500 to 3300 back and forth. The engine hours display is not working, so I had a probe around and found +12V on the + pin. I hook up my shop tach to the posts of the existing tach and run the engine, just piggyback it. This gauge has a silver face, silver bezel, orange needle, and black numbers, letters and markings. If it jumps with no. When I click the Load Light Switch, the Tachometer Needle jumps a little. The tachometer has a switch on the back for 3 and 4 cylinder I have insured it is in the 3 cylinder position. ill be going about 50 and slowly increase speed and it will do that. [J1-14] Tach filters are not required on Classic Instruments tachometers. Don't Rely on the Readings. All of the others are damped, so only the tach would show a skip from a momentary interruption. If I turn the lights on all the way the needle jumps to ~1300 RPM and sits there. I had to put a mechanical teach on it to figure out were my low idel rpm was and high rpm was then change the dial on the digital. 5 v battery, the needle should jump , don't contact long enough to peg the needle. Diameters range from 2-⅝”, 3-⅜” & 5” gauges with white or black faces. When you say the tach jumps, do you mean just the tach or does the engine actually rev with it? If so I would imagine it could be a slipping clutch. By Ruano1987, February 4, 2015 in 720. Then I took it on the road and saw that my tach reads 2750 RPM at 50 mph when I know for a fact it always was 2500 dead on. the original gm board had problems with reliability and no potentiometer to adjust rpm. If this is the case, the tachometer needs to be replaced by a professional. The MPG needle position is determined by RPM, injection pulse width (~throttle pos. The dealer should know about it since there was a bulletin for it a few years back. Not on my V, but on my 06 CTS, the tach needle would jump up and down several hundred RPM, even though I could hear the engine chugging along at a steady speed. As soon as the tach reached approx 3500 rpm the needle started jumping + - 1000 rpm's. Shop HKS RPM Tachometer with Red LED Needle from Pakistan most reliable auto store. Well after a little bit of TLC the Bike starts right up and appears to be running on both Cylinders (both pipes get hot)but I have no Tachometer. Find Analog Tach Dwell Meter related suppliers, manufacturers, products and specifications on GlobalSpec - a trusted source of Analog Tach Dwell Meter information. The needle's bouncing occurs when the car is moving when waiting at the lights. The purpose of the tachometer is to read the rotation of the engine’s crankshaft, which is shown in RPM. Re: "jumping" tach needle The tachometers that Ducati uses, even the Ducati Performance aftermarket tachometers for the older bikes, tend to jump around at certain engine speeds after a while. The tach needs to receive a pulsed signal, so connecting to a direct current won't make the needle move. I put a digital cat tach like that in mine there is a dial in the back with 1-10 on it I thank you got to. Tachometer needle randomly jumps Usually happens when accelerating fast or driving about 70mph. You can even have them set it to your current time for a fee. I recognized that this happened more when the tachometer got some condensation. The Sport II Tachometers deliver style and performance while featuring high accuracy with fast needle response for 90% of full scale. Yabba Dabba DO NOW IS WHERE THE PROBLEM STARTS. My '78 has the first year 'electronic' tachometer. You need to check this with a multimeter, preferrably an analog one, while the tach needle is bouncing. The original tach did this and so does the new Stewart Warner tach that I replaced it with. have changed the entire wire system and still problem persists. I noticed it the other nite driving about 2800 RPMS and it jumped up to 5000, than came back down. I have hooked the tach directly up to the coil, and directly to the BD tach pigtail. I carry a spare set of spark plug wires now!. I read online it can be sticky cable, or sticky gears. Press alt + / to open this. Is this a bad gauge?. I had about the same symptoms on my tach, the needle was jumping, especially when accelerating. Diameters range from 2-⅝”, 3-⅜” & 5” gauges with white or black faces. The gauge is a Faria model TC9951 that also has the 4 system check lights on it. This is first a lubrication issue. in my case my engine is running fine. Needle Size is defined as a percentage of the gauge Radius. I just installed my 6al on my 280zx and im using the tach adapter and everything and my tach needle jumps also. Most times when im driving on the highway the tach seem slight readable to but is not correct. The "guide" is perfect for accumulating debris that can then go into the dipstick tube once you pull out the dipstick. I found a lot of tach's for under $100 but most of the reviews complained about the needle jumping a lot. not 100% accurate but pretty close. Is this a bad gauge?. The code is for me is a challenge. Im having problems with a clients tach output, on a ps1000, I have 50%duty and 6 pulses, main setup 6 cylinders, wasted spark and semi seq injection I can see the ecu`s pulsed signal with a logic probe, its reaching the clusters tacho bolt, the other two bolts have 12v and ground. 2007 Corolla - Jumpy Tach and C. At D&M Restoration, we specialize in complete speedometer repair and restoration. It's OEM but was installed by the bike's prior owner. I installed the tach and fired up the bike. He whimsically depicts a group of school girls at play in the park on an early spring day. Somewhere around those same rpms my tach needle goes crazy and jumps all over. If more lubrication doesn't do the trick then you need a new cable. The tach was a N. How To Fix Your Speedometer Needle the classic speedo and Tach not working problem. its the bouncing you get when an engine sputters if you know what I mean. So i killed the radio to listen to the motor and indeed it was operating at the proper RPM, tach was reading high. -Speedo would start to not respond at startup and would kick on after a few seconds of driving - Tach and speedo stopped working completely. Try to get it on video if you can because that's probably the only chance you have of being able to get the Service Manager to "witness it" or "replicate" the issue. This can happen on acceleration or deceleration. I tried it with the tach adapter and that didnt work. Tachometer Your Mustang's tachometer gives an rpm readout based on frequency of ignition point closures. The tachometer, lites, hand warmers, all seem to be working. This is a harley tach. You can either try this or buy new/used gauge cluster (wish you luck):. On my '78 SC, the tachometer needle has started bouncing around. When I'm accelerating and get to required speed my RPM gauge either drops and steadies or jumps up then steadies back. 1 Million parts in stock - Fast Free Shipping on orders over $99. The tach is just a bonus I. It also appears the tach is not accurate over 3000 rpm's. The circuit that resulted was not doing any battery charging, but it made nice tach pulses. pivot may lack lubrication and this will cause the needle to jump from one speed to the next rather than move smoothly. Lately, the tachometer reading on the port engine has been erratic as compared to starboard engine. Last season the tach was acting up - needle would jump around. No issues there, works fine, looks great. Guess I could hook up a V/O meter and see which pin causes the needle to run up/down the scale while hitting the throttle. Michelle, Buick Customer Service. I purchased a 1994 Peterbilt 377 a few months ago and the Speedometer (and tripometer/odometer) & the Tachometer have never worked. turned the screw until the tachometer needle moved to 4500 rpm and just to make sure everything was good, I also played the 200MHz wav file to see if it read correctly too; and the needle moved to 3000 rpm - BINGO perfect! I put the ta-chometer back together again, connected the leads and I now have a tachometer that reads 500 rpm steadily at idle. had a load test done on the battery after work. The light needle for the gas guage works when it wants to and flickers sometime. and wanted them to fix it. It also never happens when sitting up or. My port tach has been fluctuating al over the place especially while at idle speed. I have hooked the tach directly up to the coil, and directly to the BD tach pigtail. Sometimes if it jumps and changes engine sound,the throttle position sensor needs changing. Unscrew it from the Tach and look at the end of the cable, it should be square and not rounded off. This item does come as shown in the pictures. I have taken it to Dodge and they say that they can not find anything wrong with it as no errors a. If it's just the tach needle jumping, then It would pretty much have to be electrical. Only at www. It is not moving at all, not with engine RPM, or even a twitch with batteries being turned on and off. The gauge is a Faria model TC9951 that also has the 4 system check lights on it. However, if you feel that this is not right, get the vehicle into the dealership. Speed of the tachometer needle (lag) is totally related to the tachometer model itself, cheap models are often slow. As soon as the tach reached approx 3500 rpm the needle started jumping + - 1000 rpm's. I took it in and my dealer reflashed the ECM, which cured it for a while. By the end of the drive, it seemed fine, so I’ll keep an eye on it. This morning i decided to swap the ignitor installed on my 240z and after opening the distributor cap i notice something is missing, i guess it could be the ground wire,so i fabricated one with 2 terminals and installed a new pertronix ignitor model 1761 together with a 40511 new 3. Sections of this page. The speedometer needle is jumping around, I have noticed that it is fine to about 40 mph , after that it jumps around by about 5 mph, above 55 or 60 mph it jumps around about 10 mph. In the sending unit, the fuel has to drop below a certain level before the float starts to drop. Guest, We need good tech writers that are willing to help out here at ZL-OA. In a quest to fix it my mechanic put in a new gear last year (Borletti 50-0806), and I recently put in a new cable supplied by Wilkinson (I previously tried lubing the old one but that didn't help). the tachometer in my 2005 Ford Mustang has stopped working. Needle was broken off (I found it inside the case). I have used Star Speedometer in Palm Coast, Fl. I have had the same happen. Do not ground on the frame, do not use a common ground wire.