As there are quite a lot of wires that have to go through the firewall, I install to passthroughs fabricated by a neighbour, thanks Didier. The assembly is done by soldering a big stainless steel washer to some stainless steel tubing. A second washer will be used to sandwich the firewall between the twi washers.



This is the cabin side once installed.



This is the cabin side. Once all the wirings are installed, the whole assembly will be covered with heatsleeve and fireresistant RTV.