Nice project!
What did the fuel selector valve originally come in? I'm looking to do a WVO tank in my Jetta once I get the diesel up and running and hadn't done a lot of research on valves, yet. That one looks perfect for the job
.
Nacht- The MKIII VWs on (93-later) have catalysts in the exhaust, so I don't
think they would do well with WVO. No experience to back that up.