Big problem for GM Many makes and models have this Problem with one or more gauges,. There was a secret

class action suit against Gm which they lost See; speedometersettlement.com. Age and Mileage where a factor , The gauge cluster was replaced and amount of money was given as good will for the trouble. But this was not well know . spoke to GM reps and no answer yes or no. So go to EBay and order stepper motors its

a easy fix, or take cluster out and send to be repaired not that costly.