If I'm running 2 8612's at the console with the GT30, GT34 and GT8 thru hull transducers, does Garmin make a Y cable that allows you to use the GT30 and GT34 into it and select which transducer you want in the settings or in this configuration do I have to use the Y cable that you Hook either the GT30 or GT34 on one side and the GT8 into the other? I was thinking I could just plug the GT8 into the head unit and the other two into a Y cable and select which one I wanted in my settings and that would work? Any knowledge/ suggestions would be appreciated.