Tachometer, Electric, Kollsman 377 Series 4000 RPM P-47 and is not visible in

and is not visible in the photo

The metal housing hosts some rust which could be removed with care

and the other for Outside pressure/altitude

Airspeed Indicators

Tachometer, Electric, Kollsman 377 Series 4000 RPM P-47 and is not visible inThis WWII era, single engine electric Tachometer was in the 377 series from Kollsman. The pointer rotates clockwise one full rotation to 2000 RPM, and another full rotation to 4000 RPM. The aircraft from which this instrument was removed appears to have had an upper operating limit of 2800 RPM judging from the limit markings in thin red tape that have been applied upon the numerical scale beneath the glass. The type of aircraft which used this