First order of the day was to purchase enough AvGas to fill up one tank so we can do the fuel gauge calibration. While we are are waiting for the fuel truck to show up, Glen is making sure all the switches and knobs, etc have a label on them. We level up the plane to simulate level flight and then start the fuel calibration. WE poured one US gallon at a time into the tank and did the calibration every 2 gallons.Drained the first tank and repeat for the other side. Fuel calibration is now complete.