A tachometer using solid state and/or vacuum tube circuitry.
NSN 6130-01-062-4723
NSN 5990-01-254-2936
NSN 5985-01-614-9322
NSN 5895-00-707-6663
NSN 5990-01-258-3848
NSN 6110-01-371-6323
NSN 5835-01-160-3045
NSN 6150-01-072-1304
NSN 5945-01-301-1072
NSN 5999-01-335-8312
NSN 7035-00-535-8109
NSN 5910-00-810-4277