A tachometer using solid state and/or vacuum tube circuitry.
NSN 5935-01-539-7088
NSN 6145-01-103-8034
NSN 5835-01-576-2040
NSN 5920-01-381-9310
NSN 5925-01-524-4718
NSN 6610-01-589-5146
NSN 6135-01-466-3980
NSN 5945-00-085-4503
NSN 5855-00-466-2309
NSN 5960-01-539-1956
NSN 5930-00-289-9901
NSN 5910-01-105-4503