A tachometer using solid state and/or vacuum tube circuitry.
NSN 5895-01-206-9316
NSN 5960-00-450-3541
NSN 6150-01-137-6150
NSN 6610-01-336-8027
NSN 6135-01-334-3935
NSN 5996-00-260-8291
NSN 5935-01-020-7578
NSN 5945-01-029-3871
NSN 7035-01-454-3284
NSN 5835-01-612-4753
NSN 5990-01-443-2931
NSN 6145-00-719-7395