Combines 9500 concave indicator

I dont own a 9510, but I have seen things like that in systems that have a bad ground connection behind the dash or where she sensor hooks to the wire harness. Could be the POT also, but if you have a DMM check the ground points. I had a new tractor last year with the power strip grounded to plastic, didn't work well. good luck on more info, let us know if you solve it.

we had a problem on our 9500 on the fan rpm changing speeds rapidly. It would go from 900 to 1250 just like that. We checked it and the sensor holder had come loose and was rubbing the fan shaft. check that out for your electrical problem first.