As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE PILOT NOTED A LH ENGINE OIL PRESSURE INDICATION APPROXIMATELY 30% HIGHER THAN MAXIMUM DURING CLIMB AFTER TAKEOFF. HE REDUCED POWER AND RETURNED TO THE TAKEOFF AIRPORT. THE CAUSE WAS DETERMINED TO BE A LOOSE CONNECTOR AT THE BACK OF THE LH OIL PRESSURE INDICATOR BY MAINTENANCE AFTER LANDING. THE CONNECTOR WAS CLEANED AND PROPERLY RE-SECURED AND MAINTENANCE VERIFIED THERE WERE NO FURTHER FAULTS. THE AIRCRAFT WAS RETURNED TO SERVICE.