Working from photos I've created a panel for Mike Stone's Bristol 170. The autopilot in the photos appears to be the old Sperry unit and the only Sperry AP gauge I've found is:
SPERRY.MARKIII
SPERRY.PILOT.AP.SWITCH
SPERRY.PILOT.SERVO.SPEED2
(all files dated 8/98)
The problem I'm having is that, regardless of AP settings, the aircraft banks sharply to one side or the other immediately when the AP is engaged; to the extent that the wings are nearly vertical within five seconds. Is this old gauge just not compatible with FS9? or a problem with the air file? or something even simpler I've overlooked?