I had a problem passing the mandatory emissions test with my Corvette C6 and modified tune, as a last resort I installed the original backup tune and passed the emissions test.
After the emissions test I installed Monte's custom tune because the difference is very noticeable. Since this flash in the DIC there's "Range Low" when cycling through the options, normally it would show the remaining Km's for the amount of fuel left.
The indicator on the dash does show the correct amount of gas, and after I filled here up the gauge also changes. So the sensor inside the petrol tank is working correctly.
Fred