Ok, I installed a new indiglo guage faceplate overlay on my 02 GT. What I didn't count on was the fact that I would have to replace the guage needles without reference to where they were origionally. I managed to get them pretty darn close (if I do say so myself) but my speedo is off by about 5mph. Is there an easier method to accomplish this other than the trial & error method I have been using? Perhaps reflash my ECM? Any help would be greatly appraciated!