In the installation instructions below, it says to remove the plug and replace with a barbed fitting for Tundra and Sequoia installs. Mine came out of a Tundra and has the fitting installed, so my plan was to pull it and put a plug back in. Now I'm thinking it would make a good port for the boost gauge though...on your setup, do you have this port plugged? If so, where are you running your post gauge from? Thanks!