Self powered
A tachometer using solid state and/or vacuum tube circuitry.
NSN 5945-00-068-9566
NSN 5950-01-465-9260
NSN 4140-00-696-4556
NSN 5835-00-378-1429
NSN 6150-01-537-0229
NSN 5950-01-382-7605
NSN 5990-01-655-1437
NSN 5920-01-512-8586
NSN 5996-00-175-0462
NSN 6320-01-072-2073
NSN 6220-01-415-9793
NSN 6220-01-298-6539