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 6240-00-411-1140
NSN 6685-01-337-4363
NSN 6320-01-039-5891
NSN 5905-00-058-3344
NSN 4140-00-231-1475
NSN 6645-01-073-5036
NSN 5975-01-322-3678
NSN 5910-01-431-1538
NSN 5960-01-290-4498
NSN 5945-01-522-0008
NSN 5999-01-406-3161
NSN 5996-01-486-5412