I got a 385 combo at the wheel now but got a x135 lowrance I'm thinking of puttin there also.. figured I could use the 385 for naviagation and the 135 for sonar.. what y'all think.. also the 135 had a puck style ducer , can I put it on the inside of the boat instead of buying a regular one to mout on the outside..if so what's the best thing to use for adhesive