What was found
NR 2 ENGINE TORQUE AND NR 2 ENGINE PRESSURE GAUGES DROPPED TO ZERO IN FLIGHT, ALL OTHER ENGINE PARAMETERS WERE WITHIN LIMITS. FLT CREW ATTEMPTED TO REGAIN INDICATION WITHOUT SUCCESS. ELECTED TO RETURN, WHERE A SUCCESSFUL PRECAUTIONARY LANDING WAS MADE. CLEANED CONNECTORS ON BOTH TORQUE TRANSMITTER AND ENGINE OIL PRESSURE TRANSMITTER. MX OPS CHECKED GOOD WITH NO OTHER DEFECTS NOTED.