A tachometer using solid state and/or vacuum tube circuitry.
NSN 6645-01-202-7986
NSN 6645-00-353-6659
NSN 6130-00-368-9234
NSN 5935-00-865-4174
NSN 6110-01-656-1611
NSN 5920-01-653-2340
NSN 6650-01-181-6037
NSN 5930-01-395-9780
NSN 6240-01-028-6737
NSN 2925-01-364-7926
NSN 6130-00-719-7219
NSN 5965-01-396-7508