Polysulfite caulk works very well to attach the puck style transducers for shoot thru hull aplications. It will set-up fairly solidly and doesn't flex like silicone and screw up the reading.
While it is true that these combo units cannot "talk" to your wind instruments, I'm not sure what they would have to say even if they could. The best case senario would be that you could have one display that could toggle thru multiple instruments, but I'm not convinced I would want that anyway. I like the idea of having all the data on screen right in front of me.
Maxum 3200 Miss Adventure
Formerly - Tartan 34C Yawl