how to fix the temp/gas gauge they are digital.

The fuel and temperature meter, when parts were originally available, were replaceable as a circuit assembly. Of course, they are discontinued by this point.. There is no known replacement part to switch it to mechanical components. You may search of course for something used nationwide. The circuit assembly part number is 78145-SS0-003 . A quick Internet search did not yield any good results but I didn't look long. Keep in mind -- this part may not be faulty at all, I have no idea -- it's a guess. Testing of the assembly ensuring it has appropriate electrical inputs and that your fuel sender and temperature sender is working is important to check. Also, assuming you've checked for any blown fuses. Last, is it possible the sections light up, but are not back lit? I believe there are illumination bulbs that back light the circuit. Good luck!