A tachometer using solid state and/or vacuum tube circuitry.
NSN 7035-00-946-0344
NSN 6650-00-266-6808
NSN 5855-01-244-9785
NSN 6150-00-205-0582
NSN 5905-01-270-7813
NSN 5960-00-407-2533
NSN 4140-00-580-8508
NSN 5925-01-331-0235
NSN 5855-00-446-5921
NSN 5996-00-342-9246
NSN 5920-00-422-5381
NSN 5985-01-083-8685