Just purchased a fuel sending monitor with cable that hooks into my NMEA backbone So that I can refuel info on my Solix G3.from what I understand in the instructions I need to hook the wires at the fuel tank in place of the factory sending unit. I have no idea how to access the the gas tank. Also does anybody know if I need to hook the cable into NMEA cable or do I hook it at the five port hub? Thanks for any info