I got a navigation system for my graduation present. The problem is, my Mazda6 only has 2 outlets. In addition to plugging my navigation system in when I travel, I usually will plug in my radar detector and cell phone. I have an "outlet splitter," but it's very inconvenient due to the fact that I have wires running everywhere. Has anyone had a system wired in behind/under the dash or had an extra outlet installed?