Ever since I’ve owned my 97 GP GT the fuel gauge has been weird. Before I replaced the fuel pump the gauge would sometimes shoot up to full after starting, a quick restart would always fix it. It’s never done that with the new one but it feels like it’s off, not only is it impossible for me to get it to full (gauge will never go over about a quarter to full) but it appears to be using more fuel than it should. Going based off the gauge I calculated around 12 MPG which is incredibly hard to believe seeing as the car runs completely fine. One time I had the fuel light come on and I shut the car off and turned it back on later and the light was off and the gauge went up a little bit from last start. What could cause a gas gauge to “work” but be inaccurate?