Tachometer, Mk V, US Navy 88-I-2500 Pre-WW2 It received signals from two

It received signals from two antennae (see photo) typically mounted on each side of the aircraft forward of the wing

This example has the manual back-up ring-and-bead sight affixed to its housing

Its use was carried over to aircraft used in the Korean War

part number 6531-1L-B

Tachometer, Mk V, US Navy 88-I-2500 Pre-WW2 It received signals from twoThis is an original WWII era electrical aircraft Tachometer, Mark V FSSC 88 I 2500, as used across aircraft of the US Navy, such as the SBD Dauntless Dive Bomber, TBM Avenger Torpedo Bomber, and F6F Hellcat Fighter. Pioneer Bendix part number 2222 IF2 A. Range 0 3500 RPM, with the pointer indicating RPM hundreds and the inset window at 9 o'clock indicating RPM thousands. This tachometer is in exceptional condition given its age. Measures 3. 25 inches