trip meter

Hey! Any pointers, ideas or solutions will be gratefully be received... I've searched the web and poked around a little, but days later, no joy :/ First the problem... When I turn the ignition switch, my trip meter resets and the instrument needles (2 left dials) are all pulled to the bottom...

Hey hope some one can help..... when ever i turn my engine off my radio, clock and trip meter all reset themselves, i have just bought this van and didn't do it when i first got it it wasn't until i took the old radio out to have a look at the back of it that it all started Rich