A tachometer using solid state and/or vacuum tube circuitry.
NSN 6645-01-196-8616
NSN 5998-01-386-4211
NSN 6220-00-450-4356
NSN 5915-00-191-9360
NSN 5855-00-925-0114
NSN 6240-00-569-5854
NSN 6150-01-007-2820
NSN 6110-00-001-9417
NSN 6145-00-174-9344
NSN 5999-00-969-3856
NSN 5965-01-030-7253
NSN 6240-01-566-3241