20 ST - mounted an air horn under the driver’s side headlight today and now I need to run a wire through the firewall for the horn button. Where’s the best place to do that? Looking in the footwell/firewall area I see a lot of insulation but no penetrations. Please point me in the right direction to find an existing penetration. Thanks.
(No, I’m not going to activate the air horn with factory horn, it will be on a separate switch)