A tachometer using solid state and/or vacuum tube circuitry.
NSN 6620-01-458-8074
NSN 5835-00-679-9769
NSN 5999-00-370-3894
NSN 5925-01-388-2763
NSN 6610-01-365-7796
NSN 5985-01-388-3503
NSN 6150-01-614-3781
NSN 5935-00-452-2221
NSN 5998-01-211-1918
NSN 6110-01-089-6260
NSN 6145-01-586-2715
NSN 5990-00-907-3912