It appears that the float attached to the fuel tank sender assembly has sprung a leak causing it to fill with gas and lose its buoyancy. You'll need to remove the assembly and repair the float.
Was the car still running when you got gas if so when you turn it off it will and should reset itself if not there are multiple fuses for the dash and gauges go to 2001ford mustang owners manual and download it for free then go to roadside emergencies there you will find the fuse box and power distribution box fuse diagrams you can download it to your phone that way you always have it when you need it
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