A tachometer using solid state and/or vacuum tube circuitry.
NSN 5975-01-371-2875
NSN 6130-01-426-8841
NSN 6105-00-833-5103
NSN 2925-01-146-0278
NSN 7035-00-897-7567
NSN 5935-00-474-6184
NSN 6320-01-029-4220
NSN 6650-01-101-4045
NSN 5965-01-322-8136
NSN 6610-01-511-0982
NSN 5999-01-360-4742
NSN 5915-01-618-4057