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 5915-01-448-5314
NSN 6135-01-317-6021
NSN 5999-01-592-9775
NSN 5945-00-495-7350
NSN 5985-01-366-2913
NSN 5975-01-092-0295
NSN 6130-00-350-3099
NSN 6150-01-271-1618
NSN 5975-00-419-7819
NSN 5950-00-651-3068
NSN 5998-01-424-8943
NSN 5930-01-238-4101