From the SkyView Installation Guide
page 7-49, fuel level sensors must be calibrated. Your SkyView display
utilizes onscreen wizards that help you do this. Go to the EMS Calibration Menu to access these wizards
(SETUP MENU > HARDWARE CALIBRATION > EMS CALIBRATION)
The fuel sensor float will hit the top of the tank before the tank is completely full. So the high limit
will be less than 20 gallons, but should be much more than 14.4 gallons.
If calibrating the Dynon can not fix the problem, the sensor float arm might not be properly bent.