A tachometer using solid state and/or vacuum tube circuitry.
NSN 5975-01-521-3275
NSN 5935-01-350-3672
NSN 5965-01-095-9767
NSN 5915-00-521-1148
NSN 6240-01-603-7326
NSN 5965-00-928-6983
NSN 5930-00-445-3285
NSN 5915-01-215-2159
NSN 6220-01-567-6932
NSN 5990-01-007-3806
NSN 5945-01-373-3482
NSN 5998-00-269-5444