The only easily accessible location to tap into the fuel system on the 6.7L is the banjo bolt on the inlet side of the fuel filter housing.  Simply remove the factory banjo bolt and replace it with the new DieselManor tapped banjo (Part #: DM-BANJO).  If you have an electric FP gauge, simply screw the sender into the banjo bolt. If you are installing a mechanical FP gauge, connect your S.S. tubing to the banjo and run the other end to your mechanical isolator.