A tachometer using solid state and/or vacuum tube circuitry.
NSN 5910-01-367-2738
NSN 4140-01-290-3608
NSN 4140-00-710-5660
NSN 5935-00-421-9349
NSN 6320-00-149-7570
NSN 5985-01-232-5773
NSN 5950-00-004-7597
NSN 5895-01-283-5733
NSN 5999-01-335-6143
NSN 5895-00-682-9339
NSN 5950-01-182-4205
NSN 2925-01-300-6602