Im a new diesel owner and I have a base model XL, i dont know if the other models come with more gauges but this model only has boost, eng temp, and tranny temp. I have been reading on here how important some feel an oil temp gauge is and im only assuming that oil presure is probably important with these engines as well. I have priced some gauges and some seem to get pretty pricey. What I was wondering was is oil temp more important than oil pres. I can prob only afford to get one gauge at a time considering some reach $200 and i wanted to start with the most important one. I do haul between 3000 and 8000 pnds prob about 150-200 miles a week. Thank you for any help you may be able to offer.