GoBucks85

I have a new to me 05 31 SS. Just found out the hard way the fuel gauges are inaccurate, especially when low. Went from 1/4 tank to E in about 10 minutes at cruise RPM. Added 25 gallons and the gauge moved from E to a little over 3/4. At some point a set of Autometer Marine gauges were swapped in. They look to require a 240/33 sender. Does anyone know what the factory fuel sender is? Or even what gauges would have been stock in 2005?