1989 chevy s 10 head unit illumination

Hey guys. I'm replacing the Dual head unit in my S-10 with a new Pioneer unit. I used an adapter harness when I installed the Dual unit so I didn't have to cut the factory wires. Looking at the adapter harness wires, apparently I didn't use the orange wire (labeled illumination, hooked to a 2-wire connector beside the yellow batt/memory wire). I also didn't use the ORANGE / white trace wire (labeled Positive Dimmer). The harness for the new Pioneer unit has an ORANGE / white trace wire, labeled "ill". So I'm a little confused. Do I need to use any of these three wires? I've already got the speaker wires and acc, batt/mem, and ground wires all hooked together. I know I don't need the blue wires (power antenna or amp remote). I don't know whether to go by the labeling and hook the two wires labeled illumination together or hook the two wires with matching colors together (the ORANGE / white trace illumination and Positive Dimmer). Thanks in advance, Robert

Does anybody have any info for me?

just cap off the dimmer wires and the illumination. dont need them at all.