A BEECH 95 ON AUTOPLT IS ALERTED BY APCH CTL OF TERRAIN. DISCOVERED AIRPLANE 90 DEGS OFF COURSE DUE TO FAILED DIRECTIONAL GYRO.

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ON AN IFR FLT PLAN. UPON CONTACT WITH APCH; I WAS GIVEN VECTOR OF 270 DEGS. I ENTERED IMC WITH THE AUTOPLT FLYING THE HDG BUG ON THE DIRECTIONAL GYRO. AFTER A FEW MOMENTS; I WAS TOLD BY APCH THAT I WAS NEARING TERRAIN AND WAS ASKED WHAT HDG I WAS FLYING. THE DIRECTIONAL GYRO WAS INDICATING 270 DEGS; BUT APCH WAS TRACKING ME ON AN APPROX 360 DEG HDG. IT WAS THEN I NOTICED THE DIRECTIONAL GYRO; COMPASS AND GPS DID NOT MATCH HDG INFO. THE DIRECTIONAL GYRO CARD HAD STUCK IN PLACE AND WAS FROZEN. WITHOUT GND REF AND CONFLICTING INSTS; I DISENGAGED THE AUTOPLT AND BEGAN A TURN TO WHAT I THOUGHT WAS 180 DEGS; WHICH WAS THE HDG GIVEN BY ATC. ATC THEN INFORMED ME I WAS 'HOLDING UP AIR TFC AT ANOTHER ARPT.' WHEN I EXITED IMC I WAS ABLE TO TRACK THE HDG GIVEN TO ME BY ATC AND MADE AN ILS APCH; IN VISUAL CONDITIONS. ALTHOUGH ATC DID NOT ASK ME TO CALL; I SPOKE WITH THE SUPVR AT THE TRACON AND EXPLAINED WHAT HAD HAPPENED. THE ACFT HAD RECENTLY BEEN FITTED WITH A NEW DIRECTIONAL GYRO AND AVIONICS; WHICH UNTIL THIS INCIDENT APPEARED TO BE WORKING. THE ACFT IS NOW BEING REFITTED WITH A NEW DIRECTIONAL GYRO. THE DIRECTIONAL GYRO IN QUESTION HAD BEEN YELLOW TAGGED (8130) AND RETURNED TO SVC PRIOR TO INSTALLATION IN THE ACFT.