A tachometer using solid state and/or vacuum tube circuitry.
NSN 5998-01-207-0088
NSN 6145-00-223-2885
NSN 2925-01-386-7392
NSN 4140-00-860-1373
NSN 6240-01-428-9410
NSN 5910-01-037-1716
NSN 5910-01-487-6757
NSN 2925-01-633-0225
NSN 6145-00-927-0135
NSN 5960-01-457-7432
NSN 5960-01-120-2170
NSN 5945-01-472-2099