Originally Posted by radmanly
If you haven't done so already, check out the nav installation instructions available
here. If your Crossfire is a 2005 or above (as your sig says), you shouldn't need to tap the speed sensor or backup signal as shown on pages 5 and 6 of the installation instructions. Your car should already be wired. To be sure, look at the wiring harness that goes to the back of your head unit and compare it to the diagram in step 12 on page 5.
I have a 2005 limited roadster and I had to run the speed sensor wire from the harness to the wheel speed wire at the amp. I have a low build number for a 2005 roadster and maybe the higher build numbers are pre-wired.