Already googled, but need to know how big of hole is needed for the connector end and what are you using to cover hole? Do they make a clam shell that big? Thx in advance.

My google must be different than yours. I got the Panoptix Livescope installation instructions that included a step saying that a 1 1/4 inch holesaw is needed to drill a pass-through hole.

There may be a clamshell that covers that, but that still lets water in, and exposes the layers of whatever you drilled through. I'm handy with tools, so I've made several cable covers using a piece of 1/2 inch starboard, typically cut at 2" x 2" or so. I use a router and round-over bit to put a nice dressed bevel on the top edges of the block. On the underside, I route a channel the diameter of the cable, or slightly larger if I want the cable to be able to slide in/out. I countersink screws in 4 corners, and poof, I've got a nice cable hole cover. I've seen some sold for $20+, which is ridiculous for what it is, but I like mine better.

That is a great idea.
I have a new project. 😀

I know I have some scrap starboard somewhere,
Thanks
Mo

I use two step bits to work up to the size desired, then cover with the clamshell or black plastic cover.

1.25" diamiter

where would one find such item ?

I need about 4 ,, all different sized, 20 years of changing electronics and trolling motors leaves a few holes.

Mo

Rubber marine grommets

https://www.amazon.com/marine-grommet/s?k=marine+grommet