Just a 1/8npt plug. Go to napa and get one. On second though if your willing to spend that much on a gauge, than go here http://www.tvdiesel.com/exhaustsyste...onents-18.aspx and buy a full 4" turbo back exhaust for the same price as the gauge.

 

i dont have enough money . only reason i bought the gauge is because lordco said it was the only one they could find that would work , maybe they are full of it , i have a decent aftermarket exhaust i am planning on removing the muffler though

 

Dont worry about the exhaust to much, one piece atta time.

 

i like my exhaust anyways ! , next thing is leveling kit/paint ! i love my truck , also need the rear mainseal done

 

From my experience with rear mains, I would get a Cummins Rear main, for what ever reason the napa brand start leaking again soon.