A tachometer using solid state and/or vacuum tube circuitry.
NSN 5950-01-350-3702
NSN 5990-01-044-8804
NSN 6135-01-110-9470
NSN 5935-00-322-9442
NSN 5990-00-274-3225
NSN 6110-00-424-4557
NSN 5905-01-179-4200
NSN 5996-01-554-9031
NSN 6240-01-045-3820
NSN 6620-01-280-9478
NSN 5925-01-310-1312
NSN 5945-00-355-9505