Hi Richard,
I read your post at IWSTI forum:
https://www.iwsti.com/threads/input-...-hfs-3.188058/
"However, you can use the relay output to actve the car's "safe-mode" instead of reducing boost. Don't forget "test-mode activation" will reduce boost anyway."
Do you mean it is the brown/white cable to connect to the safe mode instead of the wastegate? If so, do I just splice the Pink (pin27, socket B) cable and connects both ends to the brown and white cable of the Aquamist?