Radar Pressure Indicator, 0-25 PSI ABS, AW 1 7/8-31-B2F29 Martin Here is a WW2-vintage electrical

Here is a WW2-vintage electrical Free Air Temperature Indicator

made by Parker Aircraft Co

See photos of the spec sheet from 1944

but also the firing control problem/solutions

The scale is interesting in that the long pointer rotates clockwise from the 6 o'clock position indicating altitude in 100 Meters per index tick mark along the outer scale

Radar Pressure Indicator, 0-25 PSI ABS, AW 1 7/8-31-B2F29 Martin Here is a WW2-vintage electricalHere is Radar Pressure Indicator use in radar equipped aircraft during late WWII and post WWII. It is in decent condition for its age. Measures ~2. 25 inches diameter and ~2 inches deep. See photos.