Fuel Flow Indicator, Dual Engine Bendix 6007-68C-7-A, PV-1, PV-2, P2V USNavy C-47 The center knob turns and

The center knob turns and rotates the only pointer around the dial

this Boresight Telescope

which would be displayed on the ALT gauge

Here is an Altimeter used in military aircraft of the Air Service

Fuel Flow Indicator, Dual Engine Bendix 6007-68C-7-A, PV-1, PV-2, P2V USNavy C-47 The center knob turns andThis is an authentic vintage Dual Engine Fuel Flow Indicator as appeared in the US Navy and US Coast Guard Patrol Bomber Lockheed PV 1 Ventura, as well as the Lockheed PV 2 Harpoon, and P2V 7 Neptune, made by Pioneer div of Bendix, PN 6007 68C 7 A. See photo of PV 1 Instrument Panel from the Pilots Flight Manual dated 1944 showing instrument location. Its face has embossed "BU AERO USN" i. e., Bureau of Aeronautics, US Navy. It is also stamped with