A tachometer using solid state and/or vacuum tube circuitry.
NSN 5975-00-325-9032
NSN 6130-01-050-8723
NSN 5985-01-475-8016
NSN 2925-01-534-7018
NSN 5920-01-372-7122
NSN 5895-00-463-5301
NSN 5975-00-134-5688
NSN 6135-01-578-1148
NSN 6220-01-393-4308
NSN 5895-01-579-3208
NSN 5999-01-644-6508
NSN 6130-01-216-6401