I recently bought a helix 7 g3n side image that comes with a transom transducer. I have installed. I want to use (at least temporary) an older helix 7 g2 down image that is now mounted right beside it for maps and maybe down image off the transom. When it boots up it wants to go to simulation mode since no ducer connected. Is there a y cable that would connect the two. I know you cant see side and down at same time. just want to bypass the startup issue and maybe occasionally use it for down images..