A tachometer using solid state and/or vacuum tube circuitry.
NSN 6220-01-390-8620
NSN 6110-01-650-6867
NSN 6145-01-649-0650
NSN 5960-01-054-3752
NSN 5990-01-374-3877
NSN 6645-00-854-7505
NSN 6150-01-361-8133
NSN 4140-00-185-9694
NSN 5915-01-413-4784
NSN 6650-01-512-9650
NSN 6150-01-223-9144
NSN 5895-01-587-6772