I am curious as to where you bought it from? The good news is that is can and will work on your truck even though at this point it should not be advertised on the 12v trucks.
Right now your EGT, Transmissiona and Coolant temp should work correct. You will need to select one of the 98-02 Dodge trucks in the menu.
Now, in order to make boost read you will end up needing our analog boost converter. Basically it is a small part that you hook up like a mechanical gauge and it converts this into a singal for the Commander. They are not readily available yet but, should be in the next couple of weeks.
Also you should be able to return it for a full refund provided your dealer honors our 30 day money back guarantee?
Hope that is some help to you?