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 6320-01-611-4918
NSN 5999-01-457-3852
NSN 6240-01-643-9173
NSN 6240-01-584-6774
NSN 5950-01-634-0677
NSN 2925-01-138-8104
NSN 5835-00-711-3371
NSN 6685-01-485-0003
NSN 5895-01-032-5929
NSN 6135-01-487-6275
NSN 5915-01-559-0396
NSN 5999-01-430-7175