Tachometer reads wrong
I have a 2003 Yellowstone Quatro 40 foot motorhome 330 cummins and last trip in I noticed tech reading very high rpm's after check temp gauge I stopped walked back to engine rpm sounded normal. shut down engine after an hour or so restarted and it was fine. A week later ready for a trip and when I started it read way off again always high now it seem to be starting in the middle of the gauge and 60 mph it reads off the scale. Any ideas?
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