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 6610-01-359-6555
NSN 6610-01-615-0979
NSN 5895-01-043-2193
NSN 5835-01-091-2553
NSN 6105-01-323-6572
NSN 5975-00-221-2555
NSN 6320-01-607-1491
NSN 5910-00-406-8863
NSN 6105-00-211-5746
NSN 5998-01-089-8180
NSN 6130-01-321-3328
NSN 6135-01-322-4655