A tachometer using solid state and/or vacuum tube circuitry.
NSN 5855-01-073-9063
NSN 6645-01-319-6583
NSN 6620-00-308-2531
NSN 6650-00-143-1889
NSN 6110-01-421-2714
NSN 6130-01-091-4399
NSN 6620-00-401-8489
NSN 6645-01-372-7475
NSN 5996-01-254-4635
NSN 4140-01-525-2201
NSN 5935-00-151-4569
NSN 6610-00-420-3089