A tachometer using solid state and/or vacuum tube circuitry.
NSN 5915-01-351-8037
NSN 5990-00-477-1362
NSN 6610-00-350-1091
NSN 5855-00-337-3679
NSN 5910-00-807-4577
NSN 2925-00-149-0760
NSN 6620-01-412-0938
NSN 6240-01-183-4569
NSN 6685-01-064-1442
NSN 6240-01-195-6014
NSN 5996-00-518-3528
NSN 5895-01-321-1849