Here's what I did for my amp...
Power cable up the driver side, signal cable up the passenger side. Both run under the door sills until the end of the door..then run under a little carpet, under a plastic runner piece, then tucked down beside the rear seat and finally behind it. The seat and back portions of the rear seating area are separate, which means there's space behind where the two portions meet. Run both power and signal cables to about the middle of the rear seat, then shove them in towards the trunk as far as you can. Go back around to the trunk, get in, and reach under the seat support and try to feel the wires. You should be able to get them through this way...actually, you WILL if you do it the right way. Hope this helps. As for the dash, why do you need to take it apart? The only reason it would need to come totally apart or off is if you were to replace the heater core. Be more specific with this one, as you may not have to dissasemble it at all...it's a wicked PITA. Good luck...
-DG-
