A tachometer using solid state and/or vacuum tube circuitry.
NSN 5920-01-359-8720
NSN 5999-01-623-3825
NSN 6145-00-243-0583
NSN 6130-01-485-0411
NSN 4140-00-274-9638
NSN 5855-01-236-9645
NSN 6130-00-240-4765
NSN 5895-01-661-0664
NSN 5960-01-573-6483
NSN 5905-01-535-7014
NSN 6105-01-035-9190
NSN 6105-01-299-9135