Just put Kirk Hammersmith on an airplane back to Sacramento. He was in Las Vegas for one day to program, personalize and set up my Chelton/Sierra EFIS and Crossbow AHRS. His service is invaluable. My guess is I could have muddled through all of it and maybe eventually got it right, but it would have taken days literally. I did the fuel calibration myself. It took me 4 days to get it right. It normally takes Kirk 3-4 hours! He also gave some great advice from his vast experience with other builders. Get his help, he is definitely worth it. Best Regards. Dave Link.