A tachometer using solid state and/or vacuum tube circuitry.
NSN 6620-01-197-8207
NSN 6620-00-690-8905
NSN 6320-01-177-3192
NSN 5930-01-266-9792
NSN 5998-00-607-6266
NSN 6685-01-270-7536
NSN 5960-01-461-9284
NSN 6320-00-116-3658
NSN 5835-01-232-6904
NSN 6685-00-802-8809
NSN 6130-00-187-0211
NSN 5985-01-018-9431