A tachometer using solid state and/or vacuum tube circuitry.
NSN 5950-00-230-8759
NSN 5895-00-338-7163
NSN 6645-01-062-6705
NSN 5925-01-125-5078
NSN 6240-01-528-6792
NSN 6150-01-126-4300
NSN 5960-00-715-9227
NSN 5905-01-644-6445
NSN 6220-00-085-5206
NSN 5975-01-003-6746
NSN 5895-01-243-8516
NSN 6150-01-227-8803