A tachometer using solid state and/or vacuum tube circuitry.
NSN 6610-01-651-0987
NSN 5925-01-500-1352
NSN 5920-00-160-2405
NSN 5998-01-645-5504
NSN 6150-01-317-8534
NSN 5985-01-512-9126
NSN 5999-01-507-0914
NSN 5945-01-605-4274
NSN 5935-00-891-1474
NSN 5960-01-604-1158
NSN 6610-01-606-0380
NSN 5985-01-515-8115