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 6685-01-045-8512
NSN 6645-01-242-0340
NSN 5855-01-112-7725
NSN 5935-01-244-5014
NSN 6320-00-823-2015
NSN 6620-01-158-7309
NSN 6240-01-100-4158
NSN 6645-01-127-6252
NSN 5998-01-411-4395
NSN 5945-00-133-3007
NSN 6240-01-492-5045
NSN 5950-00-841-6012