Fuel guage

I have a 2012 RV 7 with dual G 3s when the fuel tanks are full the right tank reads full the left tank reads 1/2. While taxing the left gauge bounces between empty and half full. Does any one have any ideas. Tony Petrone

First thing To do is re-calibrate both tanks to see if that is the issue. Procedure is in the G3 installation manual. No short cut, go thru the whole procedure

Thank you i will hunt up a installation manual. Tony