A tachometer using solid state and/or vacuum tube circuitry.
NSN 6145-01-634-0388
NSN 5990-01-480-9938
NSN 5945-00-274-5690
NSN 6105-00-458-2987
NSN 6150-01-246-7415
NSN 5960-01-654-4353
NSN 5975-00-945-0889
NSN 5996-01-429-0390
NSN 6105-00-794-0255
NSN 6685-01-054-3735
NSN 5998-01-211-6521
NSN 6135-01-483-1501