My friend recently bought a 1984 528e, but I will probably work on it frequently. Anyways, the obc wasn't working so I removed the under dash panel and discovered an absolute mess. It looks like someone tried to retrofit an obc to the car. There was a terribly welded bracket and a giant hose clamp that held the obc brain up and the wiring was terrible. I had to tape up lots of exposed connectors.

Anyways, would it be possible to remove the obc and all of its associated wiring, or is the wiring part of the main wiring harness?

We may put a blank plate, analog clock, or replace the obc wiring if it is separate from the main harness.