Well have another issue with fuel gauge went to empty and it has fuel . Only have 6100 miles on this truck I am rebuilding from front collision . The gauge was working and now. Just shows empty but when I start gauge goes to full and them goes back to empty after is running . Also DEF gauge has moved to show more def was added. But I have not added any . Can it be calibrated ? Can I check with Alfa OB2 ? Or is it dealer only? I checked for broke or damaged wires. But did not find any