A tachometer using solid state and/or vacuum tube circuitry.
NSN 6685-00-757-7584
NSN 2925-00-433-5429
NSN 6220-00-117-4547
NSN 5999-01-578-7720
NSN 4140-01-415-2478
NSN 7035-01-158-7673
NSN 5905-00-966-7193
NSN 6220-00-074-4224
NSN 5975-00-647-4968
NSN 6110-01-411-6000
NSN 5960-00-860-7710
NSN 6220-01-122-3155