I just bought a 798ci HD SI and I have read some posts saying they have upgraded to the larger transducer (XHS 9 HDSI 180T) My intentions are to use this in dash (ZX190 Skeeter) with a y cable to connect the normal transducer (shoot thru the hull) and the SI transducer so I can still get depth readings at speed and get SI at idle speeds. Would I be able to get better SI images by upgrading to the XHS 9 HDSI 180T or with such a small screen, it would not be worth it? Sorry if this has already been answered but I would like to see your opinions on this subject. Thanks