A tachometer using solid state and/or vacuum tube circuitry.
NSN 6130-01-215-9910
NSN 5855-01-297-1886
NSN 6685-00-717-9544
NSN 7035-01-344-4192
NSN 6240-00-316-3167
NSN 5920-01-359-3982
NSN 6150-00-402-3077
NSN 5910-01-660-9223
NSN 5920-01-381-9310
NSN 7035-01-640-9889
NSN 7035-01-623-8872
NSN 6645-00-664-4665