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 5960-01-295-8924
NSN 6110-00-396-1604
NSN 5895-00-318-1502
NSN 7035-00-483-8630
NSN 5835-01-242-9806
NSN 5895-01-537-0290
NSN 2925-00-373-8837
NSN 6150-01-415-3573
NSN 6135-00-334-4500
NSN 5915-01-224-7044
NSN 5915-00-263-2175
NSN 6610-01-033-2402