boost, pyro, trans temp, fuel pressure, oil pressure, and some folks run oil and coolant temp guages.
As for just bumping up the power and fuel mileage, I would suggest a straight exhaust (straight pipe stock at a local muffler shop for ultimate value), SCT tuner with custom tune(high hp tunes give best mpg when driven right), and a complete EGR delete.
I knew very little about these trucks when I bought mine and just kept reading every thread that popped up in the forum, eventually you learn all the quirks from the knowledgable guys on here.
they're not too bad, pretty easy system if you are familiar with newer engine managment systems. The only PITA with these is that everything is completely "shoehorned" into the engine compartment. for example to remove the left valve cover takes about 20 minutes. You have to remove about 6 other parts before you can even get to it....
depends.... if you use good tunes, delete EGR, and use sound judgment (ie don't tow a tractor with the street race tune), have good maintenance, you could 200K with no problems. But I've seen some let go at 20K, even some let go with studs (this is rare, and I've never personally seen this one, just heard about it).
If you delete the EGR and use the milder street and tow tunes only, you'd most likely be fine for many miles to come. (provided there are not any pre-existing issues)
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