Engine Gage Unit for US Army Air Force Fighters, 1942, Type B-7, AN-5774-B

The 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 had a serial number prefix of AF-42, evidence of a manufacturing year of 1942. The B-7 Engine Gage Unit displayed 3 metrics with one instrument:  Oil temperature (from 0-100 deg C), Oil pressure (from 0-200 PSI), and Fuel pressure (from 0-25 PSI).  See spec sheet in photo gallery.  The Type B-7 eventually became designated the AN-5774-B when the Army/Navy designation system was introduced during WWII. The oil temperature was measured via capillary tube (not included) and the pressures were measured via bourdon tubes. It is in good condition