I'm looking at buying edge insight cts found a new one on amazon same stock number 83830 for 332.00( comments please ) ......I have a 08 3500 deleted dpf an smarty jr set on stock I tow a good bit with horses cows equipment but don't hot rod with my truck ....I've read I need to buy an install a egt probe but is that important/ vital since I don't hot rod ( I will do just may be a few weeks down the road).....is this product a plug in an ready to go setup if you wait on the egt probe..thanks