A tachometer using solid state and/or vacuum tube circuitry.
NSN 5930-00-392-5716
NSN 6150-00-729-9292
NSN 4140-01-370-7945
NSN 5905-01-274-3225
NSN 5998-01-534-7904
NSN 5945-01-157-4611
NSN 5975-01-550-2237
NSN 5975-01-091-9080
NSN 5855-01-488-6571
NSN 5910-00-867-3501
NSN 6145-00-990-9700
NSN 5915-01-578-9453