Tachometer, Sensitive, Electric, US Navy, 88-I-2385-100 AD Skyraider P-2 Neptune The serial number prefix is

The serial number prefix is AC-42

made by Kollsman

This specimen of the Model 2 Sensitive Altimeter is made by Tanaka

vs a more concentrated drop over a specific site such as a ball bearing factory

Tachometer, Sensitive, Electric, US Navy, 88-I-2385-100 AD Skyraider P-2 Neptune The serial number prefix isThis is a 1950's era single engine, electrical, aircraft tachometer made by General Electric under contract for the US Navy, part number 8DJ57GAB, FSSC number 88 I 2385 100. This appears to be the type used in the Douglas Skyraider attack aircraft, models AD 2 and AD 3 (see photo of instrument panel from its flight manual dated 1950 showing the location of the tachometer). RPM in 100's is indicated on the outer scale. RPM in 1000's is indicated in the