For Sale: Bully Dog Watch Dog. This is a gauge that provides a bunch of engine data you normally don't have available on this generation of truck. I took it off of my 2001 2500 Dodge Diesel when I purchased a newer 2013 2500 RAM diesel. Since the new truck has the data available, I didn't bother installing it. I spent over $200 on this unit and it has been sitting on the shelf for the past few years. If you can use it, throw me an offer.