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 6135-01-439-8669
NSN 5985-00-155-5991
NSN 5975-01-073-6539
NSN 6150-01-431-5105
NSN 6610-00-186-3433
NSN 5915-01-193-9968
NSN 5925-00-080-5044
NSN 4140-00-230-4252
NSN 5855-00-925-0114
NSN 5920-00-063-0532
NSN 5905-01-214-8476
NSN 6145-00-786-1172