A tachometer using solid state and/or vacuum tube circuitry.
NSN 5975-00-816-7915
NSN 4140-00-728-3097
NSN 5935-01-582-3237
NSN 6150-00-163-4511
NSN 5930-00-116-8211
NSN 5905-00-062-4038
NSN 6610-01-445-1036
NSN 5855-01-406-7237
NSN 5910-00-924-5111
NSN 6145-01-323-6509
NSN 5855-01-414-6265
NSN 6105-01-108-4734