i guess i wasn't quite clear in what i was trying to explain in regards to the needle..... i wasn't meaning that you needed to REMOVE the needle and re-position it in the place you want it at, i was just meaning to re-point it in another direction. much like you would do in turning back the hands on your wall clock (and not using the dial wheel on the back-side). both replies are good information,and thanks.......but what i'm asking is do you need to give your fuel guage a reference point in what exactly is "F" ? what keeps your fuel guage from reading "F".......down at the bottom of your guage? this is what i'm talking about in terms of "calibration".