You do get Boombox functionality.I'd assumed that the harness would be terminated with a connector.
Might just get Tesla to do it, although it says you don't get Boombox functionality. I'm not quite sure how you can have one without the other?
Nerd time .. there is essentially one gateway config setting for 3/Y for the PWS, “pedestrianWarningSound”, and it just defines if the speaker is present or not. If that config value is set, the car will know to show Boombox functionality.
Also don’t believe the website either on compatibility. It said mine wasn’t compatible and I suspected otherwise so I just booked it in directly with no issues.