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2002 Mack Ch 427 Speedometer troubles

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take the cluster out and clean the ground post on the cab frame. It's to the left, take the star washer out and toss it. trim any heatshrink glue that may have oozed out and re=install it. also do the same at the fues panel on the right side and also check the ground breaker on the firewall next to the starter relay, clean the frame ground behind the left steer tire and the big 5/8" ground bolt on the engine block in front of the starter... joey...

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