Pressure Gauge, Dual Engine, Japanese G4M Betty Bomber Beaufort 5 inch pocket reference was

5 inch pocket reference was likely used by maintenance technicians at US Navy seaplane bases operating these two aircraft

As the engine speed increased

it is marked for engines 1 &2

as used in the US Air Force's first jet fighter

Pressure Gauge, Dual Engine, Japanese G4M Betty Bomber Beaufort 5 inch pocket reference wasThis is a WWII era Dual Engine Pressure Gauge as used in the Japanese Bomber Mitsubishi G4M Betty. The gauge displays pressure for both engines simultaneously, from 0 50 (PSI or bar, unknown). The G4M Betty was the main land based bomber operated by the Japanese Navy Air Service during WWII. It was a G4M in which the architect of the attacks on Pearl Harbor and Midway Island, Admiral Yamamoto, was shot down by US Army Air Force P 38s over the South