What was found
PILOT OBSERVED SMOKE IN AND UPON SCANNING INSTRUMENTS, NOTICED LOWER THAN NORMAL OIL PRESSURE AND HIGHER THAN NORMAL OIL TEMP. ENGINE WAS SHUT DOWN. PILOT ALSO REPORTED FACE OF INSTRUMENT GLOWING AS CABIN FILLED WITH SMOKE. PILOT DONNED O2 MASK AS SMOKE THICKENED. MASTER POWER WAS NEVER SHUTDOWN AND 5 AMP BREAKER NEVER OPENED AUTOMATICALLY NOR WAS IT PULLED. AFTER LANDING AND SECURING THE MASTER SWITCH THE SMOKE CLEARED. ALL DAMAGE APPEARED TO BE CONTAINED INTERNALLY AND SMOKE MOST LIKELY EXITED INSTRUMENT THRU THE VENT FITTING.