<gauges> What is this?

[7T2]

Replaced my gauge bezel today and I'm wondering where this wire goes or what it does? It looks like it got severed somewhere along the way, but I didn't see any obvious other end or anything. It looks like a ground wire for the lights, but then again not. It goes into a bulb connector but the actual wire itself doesn't look like it connects to anything.

If it were a newer vehicle I would almost say it looks like a fiberoptic wire, but I don't think that's the case. I didn't really pay attention to which gauges (if any) were illuminating before I started.

Any info?