Cabin Altitude and Differential Pressure Indicator, F-89B Scorpion P-51 The luminous markings have turned

The luminous markings have turned color with age

It was used in conjunction with suitable beacons for night landing of parachute troops

Pressure Indicator

At 145 pages

The part number and stock numbers are confirmed in the F8F Erection and Maintenance Manual dated 1948

Cabin Altitude and Differential Pressure Indicator, F-89B Scorpion P-51 The luminous markings have turnedThis is a Cabin Altitude and Differential Pressure Indicator as used in USAF's Cold War era Fighter Interceptor F 89 B Scorpion. See photo of the instrument panel from the F 89 B Flight Manual dated 1958, the indicator appears as item 12 on the right side of the panel. The indicator has two pointers one for Cabin pressure altitude, and the other for Outside pressure altitude, each which rotate as the pressures change, the differential pressure being