A tachometer using solid state and/or vacuum tube circuitry.
NSN 5895-01-248-4416
NSN 5930-00-441-9001
NSN 6610-00-949-1289
NSN 6135-00-100-0485
NSN 5920-00-858-8619
NSN 5985-00-740-7154
NSN 4140-01-083-1919
NSN 5855-00-337-3679
NSN 4140-01-291-9342
NSN 5996-00-702-5664
NSN 5960-01-340-9485
NSN 5999-00-310-4235