Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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99 % of the time since the powers and grounds are shared between all the gauges and the signals for both of those gauges are sent through 1 wire that also is the signal wire for the tach and speedo signals the issue will be the stepper motors for those gauges inside the dash cluster
the dash gauge cluster needs to come out and have the stepper motors replaced to correct this problem i am sorry to say
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