A tachometer using solid state and/or vacuum tube circuitry.
NSN 5960-01-418-2641
NSN 6320-01-292-2232
NSN 6150-01-571-2505
NSN 6320-00-405-2348
NSN 6620-01-273-7734
NSN 2925-00-240-7820
NSN 5930-01-592-2748
NSN 5835-01-028-7009
NSN 6130-01-141-7419
NSN 5960-01-196-3344
NSN 5998-01-366-6840
NSN 5910-01-317-5553