how to fix fuel gage on 2001 dodge 3500 van

Do not replace the gauge. There is a good chance the float in the tank is not working and you need to start there.If this is a cargo van its located on the top of the tank and is incorporated in the fuel sending unit with the pump. If you are not familar with this you may want to bring it to a local shop as there is some electrical diagnostics involved. https://repairpal.com/repair-shops