A tachometer using solid state and/or vacuum tube circuitry.
NSN 5835-00-247-0161
NSN 5855-01-535-7127
NSN 6320-01-364-1840
NSN 2925-01-139-7098
NSN 6685-00-260-7559
NSN 2925-01-370-6898
NSN 5910-01-416-7721
NSN 6145-01-041-6562
NSN 5835-01-232-1226
NSN 5835-00-469-3140
NSN 6145-00-948-9542
NSN 6645-00-004-8628