As long as I've got my tank off I figured I'd finally do the low fuel light fix I've wanting to do since I got the bike (my amber one works but the 4L one doesn't).  The fix calls for a 1K trim pot on the Brown/White (4L) and Brown/Black (7L) wires to the sensors.  Is this the right harness I'm looking at?

Not sure what fix you're talking about but yes, those are the fuel level lines. BMW were smart enough never to use a repeat colour anywhere in the loom.

It's one page out of that massive "BMW K100 How-To's" somebody compiled awhile ago.  Here's a screenshot if anyone's interested:

zaubertuba wrote:. . . Is this the right harness I'm looking at?

There's an excellent wiring schematic in the Portal's Tech pages.