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 5905-00-557-6013
NSN 5910-01-325-4600
NSN 6650-00-434-0188
NSN 5985-00-323-1317
NSN 5945-00-381-8043
NSN 5910-00-992-4830
NSN 5975-00-451-7208
NSN 6650-01-357-4410
NSN 5960-01-560-8461
NSN 5925-00-434-4363
NSN 5998-01-325-3064
NSN 5975-00-858-6488