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1992 GMC Sierra Erratic speedometer

My speedometer has become erratic. It is anywhere from 20 - 30 mph higher at times and at other times well below the actual speed I'm traveling. Occasionally it appears to stabilize but in those instances is still off by some significant amount. I've replaced the speed sensor and determined that is not the problem.

Additionally, when I apply my brakes or turn signals the speedometer and tachometer both take a dip back towards zero.

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  • Michael Witt Jul 19, 2009

    Just to clarify your solution. Are you saying that i need to check for resistance or volts?

    How do you identify a short in a connection and what are the two end points in the connection?

    I took the instrument cluster out previously to see if there was anything immediately obvious. There wasn't. Am I checking between the fuse input and the output behind the dashboard?

    Looking for shorts in not something I have a lot of experience in.



2 Answers

I would go to the local salvage yard and search for the same instrument cluster out of the same vehicle...trying to fix your broken one at home is very complicated if you don't know how to do electrical work...My local pick your part junkyard charges $30 for any instrument cluster and $15 on half off days...If you don't know how to remove it from a junked vehicle ask someone in the yard to help you out...another option is to look on ebay for the same used part and have it shipped to your door...I see the 1992 GMC Sierra junked often here at the four different salvage yards I visit

Posted on Jul 19, 2009

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Sounds like you have a burnt capacitor, short fuse, or short wiring in going to control panel. You should check each fuse, wires, and connections with a multi-tester. Check the resistance of each connection. Don' forget about headlight, turn signal, and 4 way wiring as well. There is an obvious short or loose fuse in the system

Posted on Jul 19, 2009


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