A tachometer using solid state and/or vacuum tube circuitry.
NSN 6610-00-941-0509
NSN 5855-00-004-0904
NSN 5925-00-393-2410
NSN 5965-01-472-7092
NSN 5910-01-449-0427
NSN 6685-01-337-5657
NSN 6650-00-113-4102
NSN 5925-01-301-9777
NSN 6105-01-287-2632
NSN 6220-01-500-2188
NSN 5910-01-184-1451
NSN 5905-00-587-7201