Hi. I would appreciate any suggestions from You people "in the know". I have an '03, HO, 6-speed, 4X4. Eventually, I would like to do a 4" exhaust, freer breathing aircleaner, and a Box (like Edge EZ or something similar). I have already bought the Di-Pricol Pyro, Boost and, Temp. guages with an Autometer triple dash pod. I, occasionally, tow a 25' Nash travel trailer, weighing about 6-7000 lbs. I live in Phoenix, Az. and, where I usually camp the elevation is 9200'. Phoenix is 1100'. My question is. Would I be better-off with a Fuel Pres. guage, instead of the Temp. guage? I'm not towing that much weight and if I keep the Temp. guage, I will have to buy a Mag Hi-tech. differential cover, and possibly, some Fast-coolers for the transmission. Do You think I would be better off with the Fuel Pres. guage or the Temp. guage? I would "very much" appreciate the benefit of your wisdom and/or suggestions. Thank You, for your help. Joe Fihn (Buffalo).