+1 just do it.Technically, your third brake light is the high mount brake light (the one at the bottom of your rear window). You're talking about wiring the spoiler I assume. If so, tap into your high mount brake light. I would strip, solder, and shrink tube for the best and most secure connection.
By regulation / law, all cars are required to have a 3rd brake light. At least in the US. I don't see why they would change standards in other countries if they're already building them a certain way elsewhere.ahhh thats simple...honestly i didnt realize my car had a high mount brake
thank you.
just make sure that when you wire the light in your spoiler up, you disconnect the light in your deck lid. It looks dumb if you have both lights going.