Screw the painless kit, worthless junk.
It takes 3 wires to make it run out of the stock engine harness. With an 06 you will need to use the Dodge fly-by-wire pedal wich will have to be hard wired into the harness but thats not too hard either just makes cruis control tricky.
If you plan to use the Dodge tranny you will need to get the PCM out of the truck too and most of the body harness so you can hook it all back up.
its really not hard, it looks intmidating but is very simple really.