A tachometer using solid state and/or vacuum tube circuitry.
NSN 6220-01-069-3685
NSN 5975-00-118-7063
NSN 5999-00-370-9638
NSN 5835-01-303-4677
NSN 5915-00-797-0166
NSN 5920-01-454-1360
NSN 5835-01-264-8782
NSN 6685-01-339-1902
NSN 6105-00-876-8057
NSN 5998-01-505-3923
NSN 5930-01-436-6735
NSN 6645-00-262-7448