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#1
12-21-2009, 08:58 PM
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1994 GMC Sierra Erratic Speedometer
At any road speed, the speedometer may read correct or it may read 30 to 50 MPH over. (Ex: 45MPH actual, reads 70 to 90MPH)
Or the needle may be swinging all over the range. This is a high mileage truck and has had 3 or 4 owners. I have owned it for two years and use it just for occasional local light hauling. Any ideas? Thanks. 
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#2
04-12-2010, 10:07 PM
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Re: 1994 GMC Sierra Erratic Speedometer
GM has a service magazine on this problem, not covered unless under warranty. You have to pull the gauge cluster out and have the dealer send it to a repair facility and they replace some diodes. Mine does the same thing I just live with it. I was quoted $300 to fix mine 4 years ago.
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NO 4 N JUNK  1994 GMC K1500 XC 5.7L 2008 Chevy Impala LTZ
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