A tachometer using solid state and/or vacuum tube circuitry.
NSN 6240-00-067-1021
NSN 6685-01-189-8225
NSN 6150-01-390-7824
NSN 6620-01-454-2450
NSN 5855-01-203-4719
NSN 5905-01-021-8320
NSN 5985-00-829-6866
NSN 6685-00-988-4439
NSN 5910-01-619-2607
NSN 5990-01-649-4647
NSN 6135-01-134-7222
NSN 5935-00-502-3128