Quote Originally Posted by Colossus View Post
My friend recalibrate his by.
-Filling up the gas tank full, easy to know where that needle goes.
-Used GPS (while driving) to calibrate speed (get on some open high way lol)
-Used his computer to see what his RPM's were then put that needle on.
-And if you let your car sit for (eg 10 min) if your drive way, you can remember your engine temp, then do the same thing and stick that needle on.

Not sure if that's how everyone does it.. just going off of what I've seen (once).
yeah it doesnt sound too fun but will probably be what i have to do if i take them off. still dont know how i would change the color though.