I am working on a RV7 that has capacitive fuel tank senders and Prinston converters. The tanks were built about 9 years ago but this is the first time the tanks have had fuel in them for calibration. The capacitive senders are a Vans part. The instructions for calibrating the fuel quantity starts from empty, however we keep getting error lights. Anybody had similar problems and found an issue that can be fixed. the EFIS is Grand Rapids Horizon.