A tachometer using solid state and/or vacuum tube circuitry.
NSN 4140-00-279-3148
NSN 6135-01-439-8669
NSN 5999-00-246-4368
NSN 5920-01-212-1536
NSN 5960-01-481-8051
NSN 5910-01-411-5343
NSN 5930-01-063-7169
NSN 5945-01-236-6585
NSN 6320-01-558-8844
NSN 4140-00-739-2033
NSN 5990-01-650-9034
NSN 2925-00-278-9468