When I made my OBC wire harness I didn't use the VW wires to connect to the cluster as shown in the 101 book but rather used Molex connectors sourced from an e-Bay vendor. The other ends of the wires are connected to switches in the center console because I liked the idea or replacing the plastic dummies with functional switches.
I'll readily agree with everyone who said that the information that the OBC provides is, well, unimpressive... Even so, making and installing the cable and getting the OBC to work was a fun project and I'm glad I did it.
more on my OBC project here;
https://rx19jones.wixsite.com/projectboxster/projectboxster-1
dj
