A tachometer using solid state and/or vacuum tube circuitry.
NSN 5975-00-099-9312
NSN 5965-01-563-9735
NSN 5965-01-374-2376
NSN 5999-01-526-3834
NSN 6150-01-441-2192
NSN 5945-01-618-5312
NSN 5985-01-314-3490
NSN 6105-01-059-6108
NSN 5975-00-407-6554
NSN 5999-01-463-5532
NSN 6150-01-459-7116
NSN 5935-00-966-7470