Even if the one you ended up purchasing is tan instead of gray the "guts" of the EVIC will be fine.
If the color is wrong just look for ANY Chrysler EVIC/OTIS that is gray and negotiate with the seller to simply sell you the EVIC frame or holder - they are all the same. Just install your EVIC computer in the frame and you're good to go. If I remember correctly there are just 4 screws holding the computer in the frame. Looking for any Chrysler EVIC/OTIS frame is a whole lot easier & cheaper than looking just for your Jeep's specific year/color.
Mine came from a 2001 Chrysler Concorde and fit perfectly in my KJ - I even used the EVIC from the Concorde. It includes TPMS and HomeLink; about the only thing my EVIC doesn't do is tell me when the hatch or rear swing gate is open - but the dash light on the Jeep does so it's no big deal.
As gtommec suggested, go with the 4-lead trailer wiring. It's easy, it's the right gauge and since the individual wires are bonded together it will be easy to string across the headliner and down the A-pillar.
Bob