Tachometer, Dual Engine, Electric, Type E-14, AN5530-2 Engines 1 & 2 Canberra The pointer floats a bit

The pointer floats a bit

WW2 vintage aircraft A-10A bubble sextant in its original wooden case with mounting hook and battery-power accessory for nighttime illumination used for celestial navigation

but can be read with the right lighting (our attempts at photos could not capture the details of the engraving

see photos

part number 1470-8-02 (FSS# R88-A-140-15) as made for the US Navy's fighter aircraft F4U-5N (and -5P and -5NL) Corsair

Tachometer, Dual Engine, Electric, Type E-14, AN5530-2 Engines 1 & 2 Canberra The pointer floats a bitHere is a WWII era dual engine electrical Tachometer measuring engine revs up to 4500 RPM. The Type E 14 AN5530 2, made by Friden part number 8DJ19 was used across multi engine US military aircraft during WWII, such as versions of fighters P 38 Lightning and P 61 Black Widow, medium bombers B 25 Mitchell and B 26 Marauder, and paired with one more dual tachometer for engines 3 & 4 in heavy bombers such as B 17 Flying Fortress, B 24 Liberator, and B 29