My speedometer and GPS are giving me to diffent reading on the speed I am travelling, the speedometer and GPS are about three miles off. Would like to know if there is any why to calibrat the speedometer?
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My speedometer and GPS are giving me to diffent reading on the speed I am travelling, the speedometer and GPS are about three miles off. Would like to know if there is any why to calibrat the speedometer?
The speedometer is calibrated to tire size. If you put larger diameter tires on your coach, your speedometer will read slow. Most Cummins shops should be able to calibrate it.