De-Icing Pressure Indicator, AN5771-3, B-17, B-24, B-29 Bombers F7F Tigercat the D-7 Airspeed Indicator is

the D-7 Airspeed Indicator is a differential pressure measuring instrument used to indicate the speed of the airplane through the air

General Electric Type DJ11 Model 8DJ11PB

Here is an Anti-Icing Indicator as used on the early 1950's US Air Force C-119 Fairchild Flying Boxcar transport

This altimeter traversed the Sacramento Air Logistics center at McClellan Air Force Base in Nov 1982 (see label)

This is a dual engine Intercooler Flap Position Indicator as appeared on the US Air Force's Korean War-era Boeing B-50 Superfortress

De-Icing Pressure Indicator, AN5771-3, B-17, B-24, B-29 Bombers F7F Tigercat the D-7 Airspeed Indicator isThis is a De Icing Pressure Indicator for the de icing system used in WWII US Army Air Forces aircraft such as the B 17 Flying Fortress, B 24 Liberator, and B 29 Superfortress. Made by Electric Auto Lite with a serial number prefix of AF43, likely made for a US Army Air Force order during 1943. On the B 17G, the indicator appeared on the Pilot's overhead Compass Panel, see illustration from the B 17G Erection and Maintenance Manual in the photos. In