So ever since I bought the truck, my gas gauge never worked. After a year of it I am SICK of it and would love to have the gauge back. The truck throws a low or high voltage code (I can't remember the exact code/description....it has been a while since I scanned her) because of this. Anyone have any idea at all of what it could be? I already tried replacing the sender unit. When I clear the codes, it reads full for a second or two, then drops back to empty. Input or first steps to take? Thanks!