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 5950-01-323-8603
NSN 5975-01-144-7176
NSN 6320-01-154-1099
NSN 6650-01-459-7155
NSN 5920-00-065-3512
NSN 5996-01-321-1927
NSN 5835-01-439-0180
NSN 6320-01-342-5195
NSN 5835-00-707-6266
NSN 6220-01-544-6350
NSN 6240-01-023-7720
NSN 6240-01-461-4429