I have read & reread about wiring the relay in & it sounds so simple. It's connecting to existing wiring, when I have never had my dash apart or looked at the ignition switch wiring yet, that worries me. I repair HVAC equipment for a living & rewire line & control wiring all the time, so this hesitation doesn't make sense. I think comparing the wiring diagrams between my 1986 NA & the 200tdi with the lack of plugs is making me overthink this. Wish I had one local to look at. I am so relieved to hear that my many hours of anxiety were unnecessary!
The voltage rating is a little higher on the TDI GPs, but not enough to cause any issues.
The advantage of a relay is that the manual GP position has a set of contacts that will eventually burn out requiring you to change the ignition switch.
We have a few heavy duty relays left if you decide you need one.