to get to the plug you will have to remove the plastic thing on top of the engine that says 6.6L duramax then remove the ac pump and push it to the side and in behind there you should see a purple conecter and plug her in and then put it all back together,but make sure you put the box that is conected to the boost controller wires is put were it will stay cool perferibly behind the drivers headlight...hope this helps..it sounds like alot of work but it can be done in about 1/2 hour...that was my first experience doing anything like it and i managed to get it done so i figured any one can do it..good luck there
pm if you have any more questions