ok im new here, but i have searched threw the archives, and can not find the answer im looking for, so heres the question. on a john deere 495 diesel belly mower, the hour meter works when it wants too, not all the time, it seems it takes it about 5 minutes to start working after the motor warms up. it is built into the dash gauges, i traced the wiring to it from the oil sending unit, did not find any problems. so could the oil sending unit be the culprit, not sending out a signal until the motor is warm ? i have also unhooked the wiring harness from the gauges and cleaned the connections, that made it better, but did not fix the problem.