A tachometer using solid state and/or vacuum tube circuitry.
NSN 5920-01-648-7824
NSN 5835-00-262-6146
NSN 5975-01-447-2771
NSN 5925-01-623-8579
NSN 6105-01-500-4242
NSN 6685-01-463-9867
NSN 5925-00-710-6642
NSN 6685-00-442-2779
NSN 6150-00-230-1745
NSN 5855-01-391-7077
NSN 6220-01-313-0094
NSN 5930-00-789-7999