A tachometer using solid state and/or vacuum tube circuitry.
NSN 5965-01-193-0420
NSN 6220-00-205-2040
NSN 5985-00-103-9682
NSN 5835-01-647-4859
NSN 5835-01-416-6455
NSN 5895-00-844-7523
NSN 5996-01-198-7707
NSN 5975-01-212-4306
NSN 6130-01-651-9837
NSN 6150-01-073-8442
NSN 5895-01-652-9718
NSN 6650-01-474-0249