A tachometer using solid state and/or vacuum tube circuitry.
NSN 7035-01-131-1168
NSN 6610-01-532-2488
NSN 2925-01-064-3729
NSN 5985-01-431-5813
NSN 5960-00-235-9251
NSN 4140-01-318-1523
NSN 5925-01-176-7182
NSN 5895-01-328-7654
NSN 7035-01-174-7878
NSN 5925-01-288-0025
NSN 7035-00-915-5798
NSN 5920-00-221-6439