A tachometer using solid state and/or vacuum tube circuitry.
NSN 5999-01-421-1811
NSN 6145-00-186-6291
NSN 5985-01-231-9272
NSN 6110-00-485-2580
NSN 6685-01-144-4384
NSN 5975-01-325-6335
NSN 5965-01-253-0451
NSN 6105-00-246-5899
NSN 5895-01-401-5388
NSN 5950-01-364-5278
NSN 6145-00-168-8687
NSN 5895-01-363-4735