How do I fix or what is wrong when my fuel gauge and speedometer do not work on my 2003 Chevrolet Malibu?

Some GM vehicles of that era had intermittent problems with the instrument clusters themselves where the gauges will not read correctly or will stop working entirely. That said, there are also indications that your 2003 Chevrolet Malibue might have other issues (other warning lights) that may or may not be related to your gauge problem. It's very difficult to try and provide an answer over the internet for this kind of issue. I suggest taking it to a repair center for an actual diagnosis so you have the proper information about what is wrong and what it might take to fix it.

It’s simply a fuse I’ve had this happen multiple times 10 amp fuse you can find it on your fuse box