Engine Gage Unit for US Army Air Force Fighters, 1942, Type B-7, AN-5774-B B-29 The controller is experienced but

The controller is experienced but a fine artifact

and the small pointer shows the fuel in 1

according to their flight manuals from the 1950's

ID-14/ARN-1 was a component of Radio Set AN/APN-1

Engine Gage Unit for US Army Air Force Fighters, 1942, Type B-7, AN-5774-B B-29 The controller is experienced butThe US Army Type B 7 Engine Gage Unit was used across a variety of aircraft of the US Army Air Force during WWII. In particular, the B 7 made by Manning, Maxwell, and Moore part number 6548 73 15 was used in fighters P 38 Lightning, P 39 Airacobra, P 40 Warhawk, P 47 Thunderbolt, and P 51 Mustang, according to the US Army Air Force's Maintenance Interchangeability Cross Reference Chart dated Dec1943. This example is marked AF USARMY on its face and