A tachometer using solid state and/or vacuum tube circuitry.
NSN 5945-00-059-3076
NSN 6130-00-935-2712
NSN 5975-01-136-4988
NSN 5925-00-393-2410
NSN 5990-01-223-9414
NSN 6650-01-633-9147
NSN 5905-00-807-1021
NSN 6145-01-202-1337
NSN 5998-01-280-5020
NSN 6220-00-578-6539
NSN 5999-01-184-9255
NSN 6150-01-407-4245