Ebb you do not "rewire" the connector.
You unplug the connector plug from the regulator.
You pull the wires from the connector plug because it wont go through the little firewall hole. (BTW I intend to drill a new hole in the firewall with grommet and sealant. No way I think those wires will go through the existing hole with all its other wires!
It's pretty simple to make a note of what wire you pull out of what hole in the connector so you can put them back the same way!
Also - if the SLSA does not come with a full set of RV12 plans, do yourself a favor and buy them.
You mount the regulator inside.
You reconnect the wires to the connector inside the plane, in the same holes they came out of, and plug it in.