We will need to prepare a few wires on the start button mount before assembling the console as the terminals won’t be accessible once all parts are installed. I highly recommend a wire stripper for wiring, it will make your life much easier. I use these wire strippers from aliexpress
Cut 3 wires:
When soldering wires, it makes it much easier to prep the terminal and wire on each side.
Prepare the terminals as so.
Strip a small end off the wires, then add a small amount of solder.
Wire up start and select same as the above.
Cut wire for on/off button at 120mm and solder it to the switch you installed on the main component mount.