Will this connect directly to my factory brake light wiring?

Yes. The harness is pre-wired to plug into your existing brake light circuit—no splicing or rewiring needed. Test the lights before final installation to confirm proper function.

Do I need to remove the tailgate or interior trim to install this?

You'll need to access the rear interior trim panel where the factory brake light mounts. Full removal steps depend on your specific FJ's configuration—refer to your service manual for the exact process.

Is this assembly weatherproof?

The housing is sealed against moisture. Inspect the gasket and wiring connectors before and after installation to ensure a dry fit, especially if you're in a high-humidity area.