A tachometer using solid state and/or vacuum tube circuitry.
NSN 6320-01-436-9228
NSN 6105-00-564-8798
NSN 5945-00-141-0160
NSN 5990-01-474-3477
NSN 5855-00-532-0025
NSN 7035-01-621-4812
NSN 6130-00-150-0323
NSN 5950-01-259-4731
NSN 6220-01-003-3765
NSN 5855-00-228-8446
NSN 6685-01-230-5682
NSN 5999-00-311-3319