All R/T's dont have a tranny cooler, ya have to put one on. The best and easiest way to run a tranny temp gauge is to get an aluminum "Mopar Performance" tranny pan with the drain hole and tranny temp sender already tapped in the pan. Your tranny temp gauge will come with a sensor. You will need an adapter for the sender to mate up to the pan, you can get that at a parts store. I used and electric gauge, not a mechanical one. Very simple to install. And accurate. Autometer Phantom's. Look sweet in my tripple gauge pod. Good luck with your install.