A tachometer using solid state and/or vacuum tube circuitry.
NSN 5985-01-290-0817
NSN 4140-01-226-0637
NSN 5925-00-283-1400
NSN 6650-01-341-9838
NSN 5930-01-138-0532
NSN 6320-01-052-2118
NSN 6220-01-287-3220
NSN 5925-01-318-2377
NSN 5998-00-410-5793
NSN 5910-00-262-8554
NSN 5935-00-146-1239
NSN 6145-00-170-5274