A tachometer using solid state and/or vacuum tube circuitry.
NSN 5835-01-632-6627
NSN 5895-00-080-2003
NSN 5915-01-029-8525
NSN 6130-01-354-0508
NSN 6110-01-382-9706
NSN 5920-01-288-0145
NSN 5945-00-141-0160
NSN 6105-01-502-9759
NSN 6145-00-937-8895
NSN 6220-01-137-9906
NSN 6320-00-394-8458
NSN 6220-01-224-7817