Gauges- get some good quality gauges such as Autometer, Isspro, etc., get ahold of Raul @ Stealth
Exhaust- contact Gus @ Farmboys diesel, or Raul @ Stealth they can get you a killer deal on an exhaust
Programmer- SCT of course, with tunes from who ever you please. I run Cale's tunes from BTS, and a lot of people run Eric's tunning from ID.
Stage 1 fuel system from Trusted- This mod will help your stock injectos live a long and happy life, also will smooth out you engine.
Hope this helps, I love helping other people spend their money. Good luck with the new truck.
-French