My issue is that my machine doesn't follow any of the wiring diagrams for my model. Live where neutral should be, terminals labelled differently to the diagram, wires coloured differently to both the diagram and UK standards. It's been a lot of fun...
It's the https://heald.ca/adding-a-diy-pid-to-the-gaggia-classic-pro/ version. Not sure if that helps/hinders?
@rpm agreed. That's been my logic (whether or not I've achieved that technically...)