A tachometer using solid state and/or vacuum tube circuitry.
NSN 5925-00-529-0441
NSN 5935-01-642-8914
NSN 6240-00-797-1665
NSN 5855-01-147-6024
NSN 5996-01-007-2147
NSN 5950-01-049-5807
NSN 5835-01-602-0311
NSN 7035-00-205-8739
NSN 5965-01-472-1997
NSN 5935-01-642-3136
NSN 5855-01-526-2633
NSN 5985-01-531-1376