The Predator plugs into the obd port in the cab, load the program then unhook it and drive.
You should get gauges...at least an exhaust gas temp gauge. I'm using the predator and like it. If you tow and use a programmer your egt's need to be watched. My 5th wheel weights about 13k loaded and I see between 1200-1300 degrees going over tall bridges with the tow tune in.