Autometer Electric Gauge Help

I got autometer electric gauges. Question , they want you run 18 gauge twin conductor wire from sender to gauge. What is twin conductor wire. Thanks Ron

that is wire which has 2 seperated strands of conducting wire in it, similar to the electrical cord on a table lamp in your house.. You can get electrical wire in one, two , or three or even four conductor wires, as in trailer light wires