A tachometer using solid state and/or vacuum tube circuitry.
NSN 5965-01-489-5508
NSN 5996-01-411-6195
NSN 5835-01-632-6627
NSN 6320-01-525-4789
NSN 5905-01-536-1561
NSN 5920-01-198-6805
NSN 6150-00-281-3447
NSN 6220-00-488-2152
NSN 6650-01-299-5454
NSN 6110-00-329-3907
NSN 5999-00-046-2388
NSN 7035-01-543-9684