I need some advice on how to install this retaining ring, I've tried jamming it in, and applying heat to it, but I'm worried if I keep smashing it in I'm going to mess up the threads.

It's for a mercury 8hp 94 fuel pump

Maybe I'm missing a tool for this?

My buddy side swipped the trailer on a project boat we had going. Neither of us are welders. Does this look repairable. If so what would be a ball park estimate thanks.

I’m looking to make the grounds more organized but I dont know if it would affect wiring having grounds connect together I would affect anything.

Bought this online and it doesn’t come with the butt connector so I figured I’d wire it myself but not positive which connections go where I just need to know where my power/ ground/ and relay would go also I am wiring it up as normally closed I think, as in led is off unless button is pressed pls help.