Gun Sight, Reflector, Mk IIIA 7A/1313 RAF A-20 for the USAF Autopilot Type

for the USAF Autopilot Type E-4 (aka as the Sperry A-12 Gyrosyn Automatic Pilot System)

the indicator was positioned below the co-pilots instrument panel

We have not found documentation of its use

the unit indicated fuel quantity in four tanks: left

Pulling and turning would adjust the Nose Down marker

Gun Sight, Reflector, Mk IIIA 7A/1313 RAF A-20 for the USAF Autopilot TypeHere is a WWII era Reflector Gun Sight Mk IIIA, 7A 1313. The Mk IIIA was adopted by the RAF as the standard turret and free gun sight for their aircraft. The Mk IIIA consisted of a detachable lamp unit and an upright sight head. The lamp unit is removed by depressing a small button on the bottom of the housing, revealing the bulb and circuitry (this example is quite tight). The brightness of the bulb was adjusted by the gunner by rotating the rheostat