A tachometer using solid state and/or vacuum tube circuitry.
NSN 5915-00-338-2556
NSN 6620-01-643-5531
NSN 5990-01-186-6446
NSN 6150-01-009-2472
NSN 5950-00-846-5807
NSN 5920-01-074-6865
NSN 5998-00-016-2360
NSN 5920-01-651-0291
NSN 6150-01-167-8735
NSN 6135-01-659-3426
NSN 5895-01-481-6461
NSN 5895-01-061-6102