Suction Gage, AN 5771-5, US Army Air Force WWII Luftwaffe the pointers do not reset

the pointers do not reset

and then from 80+ knots on the center inner scale window which is revealed as the speed increases

The counter-drum-pointer altimeter consists of a pressure altimeter combined with an powered servo mechanism

used to indicate the supercharger power being delivered to the engine when demanded

The indicator measure and conveys the system oxygen pressure (i

Suction Gage, AN 5771-5, US Army Air Force WWII Luftwaffe the pointers do not resetThis is a fine example of an WWII era Suction Gage, AN 5771 5, made by US Gauge, part number AW 1 7 8 21 AK. This indicator has a serial number prefix "AF 43", evidence of a manufacturing year 1943. The AN 5771 5 Suction Gage was used across all aircraft of the US Army Air Corps, including bombers B 17, B 24, B 25, fighters P 38, P 40, P 47, P 51, and transport C 47. The Suction Gage measured the amount of vacuum generated to power the pneumatically