I Am at my end here I have a 94 silverado with 5.7 engine 2wd automatic that the speedometer will just sit there and bounce when at idle...when using the power windows the needle with fluctuate back and forth...I have replaced the whole under dash wiring harness out of same style and yr truck...i have check with diffierent clusters and still have same problem...also have unpluged and swapped speed sensors with and still have same issue....what else could there possibly be doing this. and i have also just replaced the computer and still have same problem

 

Actually, I am having the same problem with my '92. I haven't found anything as of yet, but I will let you know if I find out anything. I am not having the problem with my '95 yet thank God!

 

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