As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, THE PILOT NOTICED THAT THE ENGINE OIL TEMPERATURE INDICATOR WAS ERRATIC READING FROM 70 TO 0. THE PILOT MADE A PRECAUTIONARY LANDING AT A NEARBY AIRPORT. TROUBLESHOOTING HAD FOUND THAT THE INDICATOR WAS DEFECTIVE. A REPAIRED REPLACEMENT WAS INSTALLED AND AFTER AN OPERATIONAL CHECK FLIGHT THE AIRCRAFT WAS RETURNED TO SERVICE.