I am new to the forum and had a question on installation options for Sirius radio in a GX470. My GX is a 2003 with the NAV system. It does not have a button on the radio for SAT. I read the STICKY message for this forum and it sounds like I should try and get the direct connection using AV wires, but is this possible in my truck? What are the options for my install? Also who should I contact the dealer or someone else? Any suggestions would be appreciated. Thanks.