I have a 1990 GT, and I bought a Sony X-Plod deck with built in amp and CD player. It also came with 2 speakers that I'm gunna put in the rear. I have pulled the old deck out, and Im trying to wire it in. I need a wiring diagram if anyone has one, that would be great. I read somewhere that there is a built in AMP and I need to bypass it with new wires to the speakers?? Do I need to do that, or can I just wire it up to the old harness? thanks!