Was the temperature sending unit installed with one wire or two? I have a 1969 firebird that had a 350 with a temp light. My buddy got me a temp sender with two wires. I found the old green wire that is supposed to go to the sender according to the book, but is there another wire and where would it go? Any ideas? I have after market gauges but would like the light to work as a backup. Thanks Ron Hein