A tachometer using solid state and/or vacuum tube circuitry.
NSN 6130-00-840-8886
NSN 5920-01-371-7574
NSN 2925-01-191-5814
NSN 5915-01-234-0776
NSN 5910-00-131-7444
NSN 5905-00-155-4331
NSN 5996-00-456-1903
NSN 6620-01-532-4147
NSN 4140-00-279-3148
NSN 4140-01-106-2559
NSN 5930-01-388-9628
NSN 5910-01-068-3222