Fuel Flow Indicator, Dual, Engines 1&2, Bendix, C-121 Lockheed Constellation A-1 Skyraider Our research indicates that it

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

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

and possibly others

as well as confirmation of the part number below the illustration

This is a Gyrosyn Compass Master Indicator Type C

Fuel Flow Indicator, Dual, Engines 1&2, Bendix, C-121 Lockheed Constellation A-1 Skyraider Our research indicates that itThis 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