How to waterproof fill a 1.25" hole in boat console???

Don't think that will work with a hole that big and 3 wires running through it.

You can use fiberglass tape, wet it thoroughly and apply it on the backing before you stick it up there.

Get some plastic wrap/visqueen and duct tape it in place or use cardboard or wood to prop it up and make a backing under the hole. You use the plastic so the cardboard or wood does not permanently bond.

Let that set overnight.

Then use some fiberglass filler and fill in the hole once the cloth tape is hardened on the backside. Don't fill it all the way up if you want to throw on gel coat to make it look nice.

If you do gel coat, get some plastic (good visqueen is great) and tape one side down good. Throw on the gel coat then pull the plastic over the hole and pull it tight. Tape the other side. The plastic will help smooth out the top surface to create less work sanding to blend it in smoothly.

Also, It will need to be above 60 degrees to cure it all properly, so you can wait till spring or a nice warm day, use floodlights up close (2-3 feet) to push it to harden, or put it in a heated shop to do it today.

Fix the hole totally.

then go buy a clamshell thing or a "waterproof" thru-console wire jack with rubber seals from west marine.

Drill new hole of proper size to install new through console wire fitting.

Success.

I hope that 1.25" is a standard size so I can just use the hole I drilled yesterday.

rubber grommet that you can cut a hole in

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then go buy a clamshell thing or a "waterproof" thru-console wire jack with rubber seals from west marine.

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This.

Just seeing this thread, you didn't disappoint with the first post.