Engine Gauge Unit (Triple), Type B-7 DC-3 Also included is a spare

Also included is a spare rubber eyepiece

P-40 Warhawk

rotating clockwise as speed increases up to 390 KPH

which is missing

which explains why much of the content has a British bent and references the British Royal Air Force and the Air Ministry

Engine Gauge Unit (Triple), Type B-7 DC-3 Also included is a spareThe WWII era Engine Gauge Unit (aka Triple Gauge), B 7, displayed the performance of 3 engine parameters in one instrument: Oil Temperature, Oil Pressure, and Fuel Pressure. The B 7 unit was used in the US Army Air Force fighters P 38E Lightning, P 40 Warhawk, P 47 Thunderbolt, and P 51 Mustang according to their Maintenance Interchangeability Chart dated Feb 1945, as well as having been used in other military aircraft post war. The serial number