A tachometer using solid state and/or vacuum tube circuitry.
NSN 6110-01-016-0887
NSN 2925-01-407-4958
NSN 5855-00-198-3197
NSN 5990-01-333-2294
NSN 5920-01-297-5895
NSN 5930-00-786-0139
NSN 5915-00-780-1944
NSN 2925-01-016-3111
NSN 6620-00-959-6614
NSN 5960-01-180-8000
NSN 5935-01-315-6402
NSN 5930-01-091-9883