A tachometer using solid state and/or vacuum tube circuitry.
NSN 7035-00-541-8516
NSN 2925-01-375-9487
NSN 5925-00-924-9596
NSN 5915-01-498-9704
NSN 5965-01-339-5321
NSN 6110-01-546-2281
NSN 2925-01-645-2948
NSN 2925-01-325-3974
NSN 5925-01-211-6551
NSN 6610-00-935-7131
NSN 5925-01-172-9820
NSN 5945-01-498-0790