A tachometer using solid state and/or vacuum tube circuitry.
NSN 5975-01-313-5055
NSN 6145-00-943-7407
NSN 6105-00-153-0238
NSN 6220-01-231-2951
NSN 5999-01-581-2311
NSN 5935-01-016-6785
NSN 5999-01-073-0657
NSN 6145-01-085-5556
NSN 6110-00-150-7844
NSN 5985-01-065-3077
NSN 5835-01-584-4408
NSN 6610-01-146-8061