Thanks Simon, this is new thinking.
I agree with the possibility of the wastegate.....but.....
Watergate....this is a new term. What the heck is watergate?
1. Big project, as it involves dismantling the radiator / bumper & under tray before gaining access to the turbo for finer adjustment on the turbo wastegate. <- will hand over this part to the garage. It would be too much to ask from 硬頂你 、毛胃!
2. Already using 1 analogue & 1 digital meter concurrently, similar results.