rear radio remote

[brain_rinse]

Thanks,

This is the one I am going with. It requires a 3" hole to be installed.

That remote is intended to be flush mounted, not surface mounted. You'd want something like that in your dash panel, but not at the transom. I doubt you'd even be able to find a spot flat enough to get a good seal without gooping in a bunch of silicone. You can get a nearly identical remote that is intended to be surface mounted that would allow you to only drill a very small hole for the wire to pass thru.