my tachometer goes in and out of working, out most of the time, but if i rev it high when its out, it will jump up and then go back down to 0 after i let the throttle down, but is not accurate during this jump. it shows much higher RPM's than the engine is actually running at.

other times it will work fine, no problems, but only once in a while

its a 1993 GLT with 318K miles and a 5spd manual.

anyone have any idea what it could be?

 

Forum member and moderator Tech will probably have a more specific answer, but my thought is a loose connection at the gauge itself, or a loose connector at where the RPM signal comes from. I can't remember if these cars get an RPM signal from the ignition coil, or a seperate sensor.

 

ok, i can try checking to see what it runs to

 

Are any other guages doing anything funny?

 

no, the tachometer is the only one that does anything abnormal

 

The tach might be bad or something in the wiring. You could also try removing the ignition and fuel computers and reinstalling them and see if it helps.

 

Hello Litehwk356,

I have a previous post with some photos if my dash showing my tach at zero and the speedometer at 80+km/h.

The first time this happened I didnt know what to think.

Ill place a link when I locate is as this only happens once every couple of months. And only for a day or two then things are fine.

Its kind of weird.

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