A tachometer using solid state and/or vacuum tube circuitry.
NSN 6130-00-250-5189
NSN 2925-01-399-2765
NSN 5935-01-572-5947
NSN 5895-01-381-1976
NSN 5855-00-862-3345
NSN 7035-01-441-9509
NSN 5950-01-113-0671
NSN 6320-00-035-8781
NSN 5910-01-423-7711
NSN 6135-01-245-5876
NSN 6150-01-523-9317
NSN 6610-00-185-9434