Successfully calibrated left and right fuel tanks. Deflated nose wheel and propped up rear fuselage with saw horse until airplane in cruise attitude as measured by zero level reading (+/- 1 deg) at forward canopy longeron. Charged 5 gal 100LL in increments to 25 gal and created calibration curve following instruction on G3X. Saw no leaks and no mechanical or electrical issues. Note that voltage reading does not change above about 22-23 gal, approx.