2005 chevy silverado, speedometer and tach malfunctioning?

Russell

New member
Under no certain conditions my speedometer, tacometer and or my thermostat will fail to work. I may be going 5 mph and my speedometer may show 85 mph. My tacometer my show 6,000 RPMs whit my engine at a slow idle. The thermostat just works when it wants to. These may work individually, one at a time. Please help. Spent $269.00 and they replaced throttle control censor.
 
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