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What chassis is the coach on? These instruments are not mechanical but electrical. I would venture to say you probably have a bad sensor. I think moving it to the chassis forum the coach is on will get you some answers.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7