Reference usaf dwg 56b23624, for special markings
A tachometer that is driven through the media of a mechanical connection and includes provisions for fixed mounting.
NSN 6150-01-348-4298
NSN 5998-01-189-7733
NSN 6240-01-298-8478
NSN 6620-00-930-5680
NSN 5950-00-959-6934
NSN 5975-01-303-4239
NSN 5945-01-361-8768
NSN 4140-01-104-9279
NSN 5895-01-621-9646
NSN 5975-01-219-7196
NSN 5855-01-343-7943
NSN 5998-01-127-6204