[drdisque]

every one I'VE ever seen has the controls and since his radio brain has the plug, his probably does, especially considering its a Duratec Sable (probably an LS) and not a Taurus G or something bottom basement like that.

The Line Converter takes the spliced amped signal going to one of your speakers (rear deck are by far th easiest) and coverts it down to input amperage and wattage which can be plugged into an aftermarket amp.