A tachometer using solid state and/or vacuum tube circuitry.
NSN 5855-00-688-9954
NSN 5835-01-136-3394
NSN 6610-01-010-0276
NSN 5998-01-096-7525
NSN 5905-01-542-9115
NSN 5965-01-213-7256
NSN 5960-01-336-5459
NSN 5910-01-103-3020
NSN 5945-00-755-2301
NSN 6150-00-108-2409
NSN 7035-01-227-7492
NSN 6320-00-790-4844