Question about Chevrolet Camaro

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I have a 1991 z28 the tach goes to full deflection when I turn the car on. When car is off it read o RPM. How do I fix it?

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Try changing the tach filter. Mine was located on the fire wall behind the distributor on a 1984 z28

Posted on May 05, 2009

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I have a 1991 Chevy Cavalier and my RPM gauge had just quit working, why and how do I fix it?


A dealer or repair shop will have to check for bulletins,
in there data base,on the issue & then if the vehicle system
data is there, check with a scan tool

After that you have to follow trouble charts

People that have resolvde that issue before, may be
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Never take advice-- even here-- on a guess

Many vehicles can have the same symptom, but
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Intermittent Digital Dash


check the dash is sitting right, push on the dash. if this fixes it then you have a bad connection to the board pins on the back. if not there is a board in the dash that has failed usually down to a capacitor going, this age being a 91 model it dont cost a;lot for the capacitor/s to be changed but you will need some sodering skills to replace it/them.

Mar 06, 2014 | 1991 Buick Riviera

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1991 geo prism brake and battery came on while driving for few minutes then went off what's it trying to tell me?


the battery is really charge failure.
but happens normally under 2 ways.
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2: motor RPM drops real low, to like 500rpm or less. near stall.
and generator (alt) drops off line.
all normal, next time , look at RPM of engine when the lamps come on and that tells you what is happening.
buy a tachmeter, if no dash tach opted.
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I have a 1991 camaro and my tach wont work .it tays stuck at around 4500 rpm and goes u from there.is it grounded out maybe?


I had the same problem with the tach on my 92 Camaro. Tried the resistor fix but it didnt work. Finally found a tach board at the junkyard that worked for about a year.
I found a new replacement tach board. Only had it for about a week but it seemed to fix the problem! Hurray!!
NEW 1990 92 Chevy Camaro V8 Tachometer Circuit Board

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1 Answer

1985 El Camino - Tachometer is showing approximately twice the RPM then the engine is actually turning. Where should I be looking for the fix?


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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 available.email daddykouki@gmail.com

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1 Answer

Tach on my 1995 eldorado is not correct


I have a complete dash for a 95 which should fix it. They are kind of a pain to replace, and the one I have has 91,000 on the odometer.

Dan Lemke
danl@mvn.net

Dec 14, 2008 | 1995 Cadillac Eldorado

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