A tachometer using solid state and/or vacuum tube circuitry.
NSN 6105-01-456-3904
NSN 5975-01-089-9862
NSN 5910-01-234-1672
NSN 5996-01-543-2927
NSN 6105-00-492-6159
NSN 5930-01-498-8025
NSN 5835-01-463-2334
NSN 5910-01-272-9471
NSN 5945-00-004-9503
NSN 6110-01-164-2285
NSN 5855-01-580-8155
NSN 6135-01-226-4071