I have a 2006 ram and I just installed a 140, I dont have the camera yet, but looking at the truck I dont see a good way to get a camera wire into the cab. How do the install shops run theirs??

Assuming you have an automatic transmission, there should be a plate covering where the clutch linkage passes through the fire wall on a manual transmission truck.  You can remove this plate and drill it for a grommet.  I installed mine before I knew about that plate, I put a slit in the boot for my factory harness and passed the wires through there.

Look on page 3 of this pdf:

http://www.genosgarage.com/installation_instructions/GGInstall-DG-GaugeInstallTips03-09.pdf

Here is how I mounted my camera in the tailgate handle:

http://www.dieseltruckresource.com/dev/showpost.php?p=2798380&postcount=8