A tachometer using solid state and/or vacuum tube circuitry.
NSN 5975-01-309-4423
NSN 7035-00-185-8683
NSN 6320-01-570-8814
NSN 6620-01-270-7772
NSN 5975-00-929-8902
NSN 6320-01-631-7828
NSN 6105-01-026-0165
NSN 6610-00-946-6146
NSN 5930-00-036-9535
NSN 5990-00-505-1546
NSN 5999-01-094-6708
NSN 5920-01-409-2830