Autopilot Attitude Gyro, Lear 2175A, RAF? F-8 Crusader this indicator appears to have

this indicator appears to have a production year of 1937 (3768/37)

The calculator contains diagrams and a graph

or it was sourced there

The P-38 had two fuel quantity indicators

Sperry part number 644836

Autopilot Attitude Gyro, Lear 2175A, RAF? F-8 Crusader this indicator appears to haveHere is an Attitude Gyro component of a 1950's era Lear Autopilot System (the exact early Lear system has not been determined). This pneumatic gyro appears quite similar to those used in RAF aircraft produced by Sperry (especially the British label "Do Not Jar, Handle Like Eggs") but with an electrical pick off at the back, which likely transmitted the aircraft's attitude to the autopilot controller. Has a service label dated 1966. The face is in