A tachometer using solid state and/or vacuum tube circuitry.
NSN 5835-01-351-8429
NSN 5910-00-398-0930
NSN 5965-01-105-4194
NSN 6220-01-311-8865
NSN 5999-01-513-5287
NSN 5950-00-597-3661
NSN 5835-00-949-3018
NSN 6145-01-484-4081
NSN 5905-01-125-3656
NSN 5915-01-126-2856
NSN 5965-00-170-8676
NSN 2925-01-603-6379