+1 You can order the crossover plug from Billet Pro Shop. Ask for the crossover plug that has the provision on the top of it to allow you to hook up your aftermarket Temp gauge. That'll make it real easy for you.I installed mine in a custom plug in the burp location on the crossover. Seems to read accurately.
I wouldn't remove the stock sensor. If I'm not mistaken the computer needs that for tune purposes.
I've always heard that was pretty much the best spot+1 You can order the crossover plug from Billet Pro Shop. Ask for the crossover plug that has the provision on the top of it to allow you to hook up your aftermarket Temp gauge. That'll make it real easy for you.