So I have a 2000 Grand Prix GT that has a broken fuel guage. But the problem is that not just the fuel guage is broken. The resetable trip meter also does not count up. I reset it and it stayed at 0000. And last but not least is the digital guages above the vents. This also always tells me I only get about 11 miles to the gallon. And the digital fuel used meter always resets its self. How would I go around fixing some of these things?