A tachometer using solid state and/or vacuum tube circuitry.
NSN 6220-01-188-6962
NSN 7035-01-347-3617
NSN 5965-01-238-9287
NSN 5930-01-531-8639
NSN 5960-00-304-8668
NSN 6240-01-173-3958
NSN 5975-01-168-4374
NSN 5998-01-598-8420
NSN 5960-01-092-4762
NSN 5975-01-363-4610
NSN 5996-01-587-8948
NSN 5965-00-127-7010