If you always wanted something like an Edge tuner, this would be a good time to purchase. I have and Edge in my 2003 CTD for the gauges. Plugs into your OBDII under the dash and give you multiple readouts, including rpm, temp, trans temp, EGT (if you add the sensor), and fuel rail pressure (so you can watch your fuel rail pressure drop when the truck stalls out). I'm guessing lift pump as well.