Hi I'm new to this forum, but I got a 78 malibu and I recently swapped out my tail light harness and took out my gauge cluster. I got my harness back in and works. But when I put my gauge cluster back in i realized my gas gauge is off. I've tried cleaning the ground, unplug power and short it to ground. Everything is working but when it's working fine the needle is at the 1 o'clock position. With no ground goes to the 5 o'clock position, and when I short to ground it's at 3/4 of a tank. Please help?