Airspeed Indicator, 900 km/h, Luftwaffe Fahrtmesser Fl.22234 Lily Bomber Nakajima B5N Torpedo Bomber Type

Nakajima B5N Torpedo Bomber Type 97 aka "Kate"

This valve was used to regulate the vacuum pressure between its source (either an externally-mounted venturi tube

When the de-icing system is engaged by flipping a toggle switch

thus following the airspeed index on the inner scale

Airspeed Indicator, 900 km/h, Luftwaffe Fahrtmesser Fl.22234 Lily Bomber Nakajima B5N Torpedo Bomber TypeHere is a WW2 era German Airspeed Indicator FI. 22234, with a maximum airspeed of ~900 km h. As the airspeed increases, rotating the pointer clockwise from the 6 o'clock position, it rotates 360deg past 0 once 800 km h is exceeded, thus following the airspeed index on the inner scale, up to ~900 km h. According to AircraftCockpits. com, this was used in aircraft such as Do335, Fi103, FW190A7 9, Ta152, Go229, He162, He219, Ju388, Bf109G, Fi103, and