6620 digital tach reads 000
I went to get my combine out to get it ready for the wheat. Also, to evict the coon family living in the grain tank. When I started the combine,the digital engine tach read 000. I checked the ground speed and the fan speed, both of them worked. So, where does the digital display get itsengine speed? Is it the alternator? The coon family is going in around the exhaust pipe hole so I thought they might have pulled a wire loose. Just wondering where to start diagnosing. Thank you.