Yes Genec I am going to take the old transducer off as it does not fit but it does come with both the si and the regular transducer and i plan on getting a mounting board for it. ive just never done a thru hull mount with the transducer. Does it read well like that and if it got any gas on it with it being in the bilge would it affect it? My micron filter is back there and when I change it I sometimes spill some. SeaRay I also read where they should be mounted close together and I saw a video on YouTube and the guy mounted them side by side with the SI slightly lower than the other transducer. but the boat that he was mounting them on had a deeper v than what mine is and he could position the other transducer in the water keeping the Si out of the water and it still riding lower so it would clear the obstruction of the other transducer. thanks guys for all the help on these questions. I just want to make sure I get this baby mounted right so I can get out of it all that it has to offer!!