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1990 corvette tachometer problem, when the key is turned on the tach needle moves from slightly below 0 up to 0 but does nothing more when the engine is started and revved up

Tachometer moves from slightly below 0 up to 0 when key is turned on but does not move any more when the engine is started and revved up

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Posted on Jan 02, 2017

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SOURCE: Tach inoperative

This is a classic symptom of a defective driver in the tach's circuit board, it can be repaired by a authorized GM electronics repair center.

Posted on Dec 03, 2008

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SOURCE: my gas, tachometer and speedometer are not working

check for blown fuse for gauges,light is a pro blem code,thatll have to be scanned to point at problem area.

Posted on Mar 08, 2009

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SOURCE: The tachometer needle is out of position

Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Silverado instrument cluster repair
Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Trailblazer instrument cluster repair

Posted on Oct 07, 2010

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SOURCE: 69 Corvette Mechanical Tachometer very

i don't know if you can still get these or not, but back in the day we used to remove the tachometer and lube the head with dry graphite we used to have a little ball that we put the graphite in and screwed it on to the cable threads and pushed the graphite into the tachometer, i would think you could make one out of a turkey baster and a hose clamp, you can get the graphite at most any hobby shop......HAVE FUN

Posted on Mar 13, 2011

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1 Answer

Is there a fuse for the tachometer?

Most vehicles power the tach from the same circuit as the other instruments. So if the speedo and fuel gauge work the tach probably has power. May not have a ground signal from the engine computer.

Nov 19, 2015 | Cars & Trucks

1 Answer

My 1981 corvette tach quite working how do I get working again?

1981 Corvette has an electical tachometer that is driven by impulses from the distributor. First, check for blown fuses, next make sure the tach wire is plugged into the distributor. Next bypass silver tach filter or capacitor located by manifold to see if the tach moves at all. If these steps do not reveal a change in tach operation, then the most obvious next step is to remove the tachometer and get a new board for the tachometer. Unscrew and remove cluster lens and then unscrew tach bezel, and gently pull out the tach noting position of insulators. I believe these boards are available still at local autoparts locations. Replace board, note position of insulators and reinstall tach, bezel and lens. Old corvette are cool and are pretty easy to work on! Should be fixed, enjoy!

Feb 15, 2015 | 1981 Chevrolet Corvette

1 Answer

Tachometer Fluctuates

have battery check out should 12.5 volts.

Sep 11, 2012 | 1999 Oldsmobile Alero

1 Answer

Replaced distributor on my 1988 chevy c3500 pick up. 5.7 liter engine w/ tbi. not sure how to set timing? is advance going to change the value? looking for timing setting and procedure to reach setting...

Hi, I have pasted the procedure below. Your spec is 0 degrees (right at TDC).


HEI Systems

  1. Start the engine and allow it to reach operating temperature. Stop the engine and connect the timing light to the No. 1 (left front) spark plug wire, at the plug or at the distributor cap. You can also use the No. 6 wire, if it is more convenient. Numbering is illustrated in this section.

Do not pierce the plug wire insulation with HEI; it will cause a miss. The best method is an inductive pickup timing light.
  1. Clean off the timing marks and mark the pulley or damper notch and timing scale with white chalk.
  2. Disconnect and plug the vacuum line at the distributor on models with a carburetor. This is done to prevent any distributor vacuum advance. On fuel injected models, disengage the timing connector which comes out of the harness conduit next to the distributor, this will put the system in the bypass mode. Check the underhood emission sticker for any other hoses or wires which may need to be disconnected.
  3. Start the engine and adjust the idle speed to that specified on the Underhood Emissions label. With automatic transmission, set the specified idle speed in Park. It will be too high, since it is normally (in most cases) adjusted in Drive. You can disconnect the idle solenoid, if any, to get the speed down. Otherwise, adjust the idle speed screw.

The tachometer connects to the TACH terminal on the distributor and to a ground on models with a carburetor. On models with fuel injection, the tachometer connects to the TACH terminal on the ignition coil. Some tachometers must connect to the TACH terminal and to the positive battery terminal. Some tachometers won't work with HEI.

WARNING Never ground the HEI TACH terminal; serious system damage will result.

  1. Aim the timing light at the pointer marks. Be careful not to touch the fan, because it may appear to be standing still. If the pulley or damper notch isn't aligned with the proper timing mark (see the Underhood Emissions label), the timing will have to be adjusted.

TDC or Top Dead Center corresponds to 0°B, or BTDC, or Before Top Dead Center may be shown as BEFORE. A, or ATDC, or After Top Dead Center may be shown as AFTER.
  1. Loosen the distributor base clamp locknut. You can buy trick wrenches which make this task a lot easier.
  2. Turn the distributor slowly to adjust the timing, holding it by the body and not the cap. Turn the distributor in the direction of rotor rotation to ******, and against the direction of rotation to advance.
  3. Tighten the locknut. Check the timing again, in case the distributor moved slightly as you tightened it.
  4. Reinstall the distributor vacuum line or the timing connector. Correct the idle speed.
  5. Stop the engine and disconnect the timing light.

Mar 25, 2011 | Chevrolet C3500 Cars & Trucks

1 Answer

2005 Buick LeSabre tachometer not responding when engine is running. Tachometer stays on "0" when enige is running. Slight movement as acceleration increases; however needle barely moves as...


Oct 30, 2010 | 2005 Buick LeSabre

1 Answer

Tachometer not working, replaced sensor and still

If the wiring from sensor to tach is good then replace the tach

Jul 25, 2010 | 1990 Ford F250

2 Answers

Ignition coil

The tach wire tells the computer information it needs to have engine control.Please rate if this was helpful,thank you.

Jul 19, 2010 | 1990 Chevrolet C1500

4 Answers

The tach needle is over by the gear selector

I had same issue with my 2001 Windstar. To take the pointer needle back to its position without removing the Cluster, you will need to:
- Remove the head lights and dimming switch together with the bezel (left side of steering column). It is snap-fit, so just pull it softly from the edges
- From there, you will be able to peek and see the prndl and the red portion of the pointer stucked
- With a long soft stick (I cut a thin long portion from a manila folder, but you can also use a plastic flat stick or any thin card board material that you can cut like from cereal box) insert it into the prndl small opening between the Cluster lens and bezel to push the needle.
- If the pointer doesn't move at all and your paper stick is bended, it might be pretty stuck (due to the countinuous pushing while placing the shift is P). For that, you can use a wood stick, like a chopstick, to un-stock it. Same thing, insert it trough the opening. Do not insert it all the way, as it will not fit. This is just to unstock the pointer with the chopstick tip.
- Once it is unstuck, get back to the paper stick and now insert it again and push the pointer up until it gets back to 0 by itself.

It is higly possible that your pointer will be bend at this point (again due to the continuous pushing of the shift at P). So you might want to consider removing the Cluster lens to bend it back straight.

Important: There are several comments that it is due to some ground connections issues on the cluster, which might be true. I haven't try finding it. Your pointers will eventually jump crazy again some day. In my case this happens 2 times a year (for the last 3yrs). If this happens again, hit the top of the panel hard with your hand and the pointers will jump back.
Due to this, it will be up to you if you want to remove or replace the cluster. I didn't find it worthy.
Good luck!

Jul 18, 2009 | 2000 Ford Windstar

1 Answer

Defective tachometer and speedometer

Do the following:1)key in the ON position:remove the 7.5 gauge fuse.Tach needle should read "0:". 2)put it back,go on the engine and unplug the green plug on the igniter -the big one,with 5 or 6 wires on it.The needle on tach reading should be zero.If not you have a short circuit on the black wire between that plug and the plug on the conbination meter.3) If the reading is zero with the plug disconnected,the black wire for the tach is short-circuited inside the igniter. I have one

May 30, 2009 | 1989 Toyota Corolla 2 Door

1 Answer

Tach inoperative

This is a classic symptom of a defective driver in the tach's circuit board, it can be repaired by a authorized GM electronics repair center.

Dec 03, 2008 | 1991 Chevrolet Corvette

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