A tachometer using solid state and/or vacuum tube circuitry.
NSN 6105-01-591-4356
NSN 6240-01-034-9457
NSN 5855-01-125-9167
NSN 5855-00-327-2112
NSN 6240-01-500-0850
NSN 6150-01-268-6127
NSN 6650-01-199-8589
NSN 5895-01-575-8930
NSN 5925-01-092-5018
NSN 5910-01-421-7464
NSN 6135-00-269-5843
NSN 4140-00-198-4961