What was found
(AIR TURNBACK) TURNING THE TAKEOFF ROLL, THE CREW NOTICED THE NR 1 ENGINE OIL PRESSURE FLUCTUATING BETWEEN YELLOW, RED AND ZERO, ALL OTHER INDICATIONS WERE NORMAL. A NORMAL TAKEOFF WAS COMPLETED AND THE CREW ELECTED TO RETURN TO BASE. MAINTENANCE CLEANED AND TIGHTENED A LOOSE CONNECTOR ON THE OIL PRESSURE TRANSMITTER, THE AIRCRAFT WAS RETURNED TO SERVICE. (K)