Odometer guages not working on my Jaguar xj6 "96 please HELP?

Ok so today i pulled up to qt to gas up and i turned off my car and all the electronics died including milleage then everything came back except my odometer gauges such as:fuel gauge, heat gauge, speed gauges WTF and some other icons that are electronic on there what could it be is gonna be expensive ? im taking it up to a jaguar dealer here tommorow idk what it could be please give me some advice thanks