Tachometer, Chronometric, Type C-9A, WWII Ki-100 Mounting MT-274/ARN-6

Mounting MT-274/ARN-6

and the gauge measured each engine's crankshaft torque by measuring oil pressure in the engine planetary gear drive system

These are in exceptional condition given their age

used to calibrate the compass

Here is vacuum-driven Gyro Horizon Indicator Type AN-5736-1

Tachometer, Chronometric, Type C-9A, WWII Ki-100 Mounting MT-274/ARN-6Here is an exceptional example of the WWII era Chronometric (i. e. mechanical) Tachometer, Type C 9A, as used by single engine aircraft of the Air Corps US Army. According to the US Army Air Force Maintenance Interchangeability Chart dated Feb 1945, the C 9A tachometer was used in fighters P 40 Warhawk (E N), early versions of the P 47 Thunderbolt, and P 51 Mustang, dive bombers A 35 Vengeance and A 36 Apache, and transports UC 61 and UC 64A. This