I have read on here where everyone says that the black line behind the glove box is the boost guage line. Well I have an 04 and I have no black line, but I do have a yellow one. I believe that is it. Just wanted to confirm it. Here is a pic.
lol that picture is really big! But yeah that looks like it. Pull those apart and take out the stock plastic connector and put in your T connector. :beer: