Many of us on this Forum have used an Auber controller on their Bradleys and we have also modified pellet grills with Auber PID controllers. It would really help to know what kind of Traeger you have since it makes a big difference.
There is a wealth of knowledge here to be share and we have a multitude of members who have modified units with a PID. One who come to mind is muebe but I don't want to insult anyone and leave anyone out so I'll stop with the names.
I'm sure the big boys will chime in soon to help but like I said - they need to know what kind of pit you're using, etc.