A tachometer using solid state and/or vacuum tube circuitry.
NSN 5950-01-348-4290
NSN 5999-01-432-0949
NSN 5999-01-353-2989
NSN 7035-00-890-7649
NSN 5950-01-494-2028
NSN 6135-01-359-0051
NSN 5950-00-104-5908
NSN 6240-01-054-2289
NSN 5835-00-936-8753
NSN 5915-01-167-9558
NSN 5945-00-797-6321
NSN 6620-01-197-7665