Speedometer, M-4 Sherman Tank, #6208454 US Army A4 Skyhawk indicative of its experience

indicative of its experience

ID-14/ARN-1 was a component of Radio Set AN/APN-1

There are two electrical connectors

The pointer indicates BMEP as received electrically from a transmitter mounted at the engine

Free Air Temperature

Speedometer, M-4 Sherman Tank, #6208454 US Army A4 Skyhawk indicative of its experienceOk, yep, this isn't aeronautical, but it's certainly an interesting item nonetheless. Here is an example of a Speedometer of the type used in the WWII era US Army M 4 Sherman Medium Tank, made by the AC Spark Plug division of General Motors Corp. The US Army part number 6208454 and GMC part number AC1567470 appear on the face of the instrument. The 6208454 number is referenced by the Sherman tank's technical documentation illustration, see 2 photos in