My 96' 2500 has a gas gauge that is crazy. I fill it up to full and drive 200 miles and it goes to 1/4 tank, it should be at more like 3/4's. It then sits at 1/4 tank for the next 300 miles. Has anyone else had this problem? It just started this a couple weeks ago. I think I need a new gauge in the tank which will be a pain to replace.