A tachometer using solid state and/or vacuum tube circuitry.
NSN 5975-01-605-0289
NSN 4140-01-342-7441
NSN 5950-00-088-9254
NSN 6130-01-225-8200
NSN 5975-00-834-1528
NSN 6240-01-004-9634
NSN 6130-01-433-2215
NSN 5999-01-274-1306
NSN 6150-01-439-9726
NSN 5975-01-470-4965
NSN 6105-01-131-1408
NSN 6645-00-010-3054