tulsaraider

I own a 2008 Yamaha Raider.I recently replaced my speedo face with a custom one. It looks great, but I screwed up somewhere along the way and my fuel guage doesn't work right. Does anyone know how I could fix this. I filled the tank up, set the needle on full, then turned the key on,,,,,showed a quarter tank. So I set the needle to E,,,, turned the key on,,,, quarter tank. Any help would be awesome.