What was found
#2 ENG TEMP INDICATOR NOT PRESENT, NO SYMBOLOGY DURING FLIGHT. #2 ENG OIL PRESSURE 1.6. TEST FLIGHT EVALUATION REVEALED AFTER APPROX 3 MINUTES AT IDLE THE #2 ENGINE OIL TEMP BEGAN TO CLIMB TO THE TRANSIENT RANGE AND DISAPPEARED. BOTH THE DIGITAL NUMBER AND THE ARROW ON THE SCALE WERE NO LONGER DISPLAYED. THE ENG OIL TEMP GAUGE TURNED YELLOW AND STAYED YELLOW. REMOVED AND REPLACED ENGINE OIL TEMPERATURE PROBE. MTF COMPLETED IAW AMM 05-60-00, 6-1.