Managed to get quite a bit accomplished. Sat down with a few bad movies and started wiring.
Player 1 buttons. The wiring won't be tidied up until the artwork is applied, as I need to take the entire thing apart to apply the artwork.
This is the Happ trackball X axis connector. They have a AMOA plug in place with a harness. You unplug the X axis connector and Y axis connector and the Mini-Pac plugs directly in.
A start and coin button. The coin button is black.
The control panel is a monster and I wasn't able to reach from the bottom of the panel to the top to attach the coin buttons. I purchased some male quick disconnects and used those to plug into the Mini-Pac wiring.Pac wiring.