Brush, I have looked for the instructions I followed to link my SC1000 guages to my Lowrance 522 and cant find em tonight. I think angler557 posted them? He and I both have them set up this way along with having one of the fuel guages set from percentage to read actual gallons while leaving the tach guage to read percentage of fuel. This is a GREAT way to dial in your rig for optimium cruise MPG since you dont have to worry about a twig clogging your pitot up everytime youre out playing with the setup. It was not real hard to do, basically attached two wires coming off the GPS to two wires coming out of the SC system. Now remembering wich four wires were involved…..Ive slept since then LOL.