A tachometer using solid state and/or vacuum tube circuitry.
NSN 5920-01-157-0539
NSN 2925-01-182-0227
NSN 5960-01-628-2760
NSN 5910-01-035-4719
NSN 5835-00-269-2232
NSN 5985-01-105-0184
NSN 5935-00-874-4026
NSN 6130-00-643-4894
NSN 5999-00-765-9533
NSN 5950-01-345-8650
NSN 6145-00-229-4509
NSN 7035-01-556-7412