A tachometer using solid state and/or vacuum tube circuitry.
NSN 5999-01-034-2424
NSN 6145-00-119-8201
NSN 5910-00-618-0196
NSN 6320-01-328-6575
NSN 5935-01-605-3848
NSN 5965-01-465-4370
NSN 5990-01-492-6575
NSN 5950-01-159-2619
NSN 7035-00-155-9513
NSN 5930-00-080-6148
NSN 5996-01-437-8824
NSN 5915-01-529-9418