My dash lights taillights and gas gauge temperture gauge don't work on my 03 malibu why.

Try checking your fuse box for a blown fuse. Fuses are cheap to replace and sometimes there are spares in the fuse box, so try that. The location of your fuses should be in the owners manual, and sometimes also labeled on the inside if the fuse box. There's usually a fuse box under the hood and sometimes another fuse panel on the passenger side of the dash, you'll have to open the door and pop the side panel of the dash off to get to that one.