A tachometer using solid state and/or vacuum tube circuitry.
NSN 6145-01-443-3282
NSN 5950-01-429-1014
NSN 5835-01-455-3380
NSN 5935-01-312-9417
NSN 6135-01-540-5253
NSN 6145-01-488-5114
NSN 6240-01-597-1941
NSN 6110-01-433-3161
NSN 6645-01-023-8020
NSN 5905-00-986-9859
NSN 5996-01-426-7975
NSN 5915-00-583-1361