A tachometer using solid state and/or vacuum tube circuitry.
NSN 5990-01-407-6615
NSN 5925-01-522-8369
NSN 6320-01-504-3948
NSN 5925-01-042-8668
NSN 6145-01-417-8912
NSN 5985-00-195-0919
NSN 5895-01-263-0224
NSN 6645-00-884-5845
NSN 2925-00-246-3077
NSN 7035-01-344-8708
NSN 6145-00-482-9546
NSN 6685-00-432-3576