all depends on what you want to do with it. but your on the right track with gauges. recommend fuel gauge too even though the pump is in the tank. mine could pull the psi down to 3 before i put on my pusher pump. there are plenty of goodies out there for these trucks. i don't think they changed much for the powertrain on the 06's, have looked into it that much yet. best of luck finding your truck.
nick