A tachometer using solid state and/or vacuum tube circuitry.
NSN 7035-01-352-0766
NSN 5915-01-152-2684
NSN 5895-01-061-6991
NSN 7035-01-019-5729
NSN 6320-01-347-2638
NSN 5950-01-363-2141
NSN 6685-01-288-8408
NSN 5835-00-160-7142
NSN 5920-01-564-7441
NSN 6620-01-275-9777
NSN 5960-01-022-7322
NSN 5945-00-276-9274