Oil Pressure, Dual, Set for 4-Engine Aircraft, Type B-9A USSR This type of communication

This type of communication

type T-203

This is an exceptional example of a remote-indicating Course / Directional Gyro Indicator as used in the 1950's Korean War-era MiG-15 jet fighter and other aircraft of the USSR's Soviet Air Force

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the aircraft is at its maximum allowable airspeed or maximum allowable mach speed

Oil Pressure, Dual, Set for 4-Engine Aircraft, Type B-9A USSR This type of communicationHere is a set of WWII era Type B 9A Dual Oil Pressure Indicators, as used in four engine of the US Army Air Force such as bombers B 17, B 24, and B 29 and transport C 54. These are Bendix Autosyn indicators, which used pressure sensors at the engines which electrically transmitted the signal to these electrical indicators. Both are labeled "AF US ARMY" on their faces. The indicator marked for engines 3 & 4 has a 1944 manufacturing serial number