Did anyone else on here know that 1999-2003 mustang gt if you hold the trip rest button before you turn the key on and turn to the on position and keep holding it will bring you to a dealer screen or something like that. It tests your guages fuel etc. I don't know which year's don't this mine is a 2000 gt. Good info to have. Especially when the guages like the fuel guage stops working like mine did.