There is a special wire harness that passes two heavy gauge wires through the firewall (red and black). The bulkhead connectors wont handle the amperage this pulls. Also there is a relay module of some sort under the dash for it. I found a NOS one for my car because the existing one was damaged. Im still looking for the correct switch if anyone has one.
I saw those wires and was unsure what they were for. If one of my sells for the whole system doesnt go thru I'd sell you the switch. Send me a PM so I can keep in mind who you are.