Fuel Flow Indicator, Dual, Engines 1&2, Bendix, C-121 Lockheed Constellation A-1 Skyraider This is a Gyrosyn Compass

This is a Gyrosyn Compass Master Indicator Type C

and possibly others

Our research indicates that it may have been made for the Canadian-designed/manufactured Cold-War-era interceptor aircraft

as well as confirmation of the part number below the illustration

The knob is used to set the dial to match engine RPM

Fuel Flow Indicator, Dual, Engines 1&2, Bendix, C-121 Lockheed Constellation A-1 Skyraider This is a Gyrosyn CompassThis is a dual Fuel Flow Indicator, for engines 1 & 2, as used in the US Air Force C 121 transport version of the Lockheed Constellation. See photo of the location of the instrument on the Flight Engineers instrument panel from the C 121 flight manual dated 1958. The data label shows manufacturing for an order by the BUAER, Bureau of Aeronautics, US Navy, so it was likely made for a Navy version of the C 121 (R7V 1) or another US Navy aircraft. It has