Ammeter/Voltmeter, WWII Japanese Aircraft Douglas combining directional finding and general

combining directional finding and general radio signal receiving

all documentation we've seen on these aircraft illustrate the type B-5 ignition switch

By rotating the sight to align with the angle of terrain travel vs the intended aircraft course

and US Navy versions R4D 6 & 7

Ammeter/Voltmeter, WWII Japanese Aircraft Douglas combining directional finding and generalThis is a Japanese Voltmeter or Ammeter. The scale is labeled to a value of 2. 0, and "2000V" is embossed in small lettering in the upper right of the dial, so we aren't sure of the exact function or application. It is presumed to be a WWII era indicator used in aircraft of the Japanese Army or Navy. This has not been verified. Aircraft that may have used this have not yet been identified. It has the "YEW" symbol of the Yokogawa Electric company on