A tachometer using solid state and/or vacuum tube circuitry.
NSN 2925-01-577-9269
NSN 5910-01-591-6189
NSN 5990-01-319-5667
NSN 5895-01-168-8738
NSN 2925-01-282-3206
NSN 5935-00-904-1824
NSN 5990-01-516-9665
NSN 6110-01-225-5953
NSN 6135-01-592-4139
NSN 5985-01-099-2735
NSN 5990-01-400-3299
NSN 5925-01-431-8886