A tachometer using solid state and/or vacuum tube circuitry.
NSN 5855-00-185-1560
NSN 6145-00-104-6047
NSN 2925-01-523-3607
NSN 6150-00-511-4380
NSN 5990-01-595-9441
NSN 5985-00-893-4919
NSN 5930-00-274-7167
NSN 6320-01-476-7702
NSN 5925-00-113-0518
NSN 6220-00-536-5738
NSN 2925-00-233-5644
NSN 5935-01-165-0181