A tachometer using solid state and/or vacuum tube circuitry.
NSN 5910-01-210-0082
NSN 5996-00-633-4308
NSN 5965-01-471-5902
NSN 5855-01-504-2646
NSN 5920-01-204-6419
NSN 6610-00-614-7943
NSN 5945-01-456-5450
NSN 6240-01-444-9956
NSN 6620-00-811-7614
NSN 6685-01-037-6371
NSN 5996-01-510-3257
NSN 6105-01-354-3580