A tachometer using solid state and/or vacuum tube circuitry.
NSN 5910-01-497-7934
NSN 5895-00-803-9829
NSN 5910-00-570-7524
NSN 6685-00-642-0533
NSN 5945-01-232-6466
NSN 5855-01-569-4057
NSN 5990-00-887-7053
NSN 6130-00-438-3905
NSN 5855-01-631-9169
NSN 6320-00-564-2772
NSN 5895-00-481-4202
NSN 6150-00-811-4540