The painless kit is well worth the money. That's what I used when I did my swap years back. As soon as I get my Cutlass painted I have to remove the harness and sell it since the LS is completely different.Very nice. The harness that comes out of the passenger side what does that control anyways? Can I scrap that and just run my new harness and computer in same location.. I'm at the wiring stage on mine now (painless kit)...