After being laid up for half of last year due to a severe leg injury, I finally made it out to fire up the truck for the first time. The battery was dead so I charged it up overnight and tried again the next morning. When I turned the key...nothing. Strange thing was my fuel gauge pegged on full and has stayed there since. I had the battery checked and it tested bad so I replaced it. I have been driving the truck but it would be nice to know how much fuel I have. Has anyone ever encountered this? I have tried the various tests with jumper wires etc. but to no avail. Any help would be appreciated.