I have a Scangauge II that reads and clears codes I think it was about $200. It also monitors 4 items at one time. My Areoforce gauge does the same in my pillar pod mount monitors 2 functions reads codes and resets. HP tuners is the way to go if you can swing it! I have all three.
2006 Superior Blue Trailblazer SS AWD, Stock as a rock
Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).
Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning