IF you feel really compelled to monitor drive pressure, drill a hole in the exhaust manifold and hook a boost gauge up to it. You have to run a few feet of copper tubing from the fitting on the manifold to the start of the nylon tubing that goes to the boost gauge as the heat is too much for the nylon. Chances are at some point it's going to get clogged though from the soot, and you're going to have to clean it out.