The top tabs of my gauge bezel were completely destroyed. I picked up some marine grade epoxy from the Home Depot and filled the broken out bits in. Then drilled some new holes. It's working great.
You can use some tape or foil as a backing for the epoxy while it sets. The marine grade takes about 24 hours to fully cure. Also it's very hard to tool then, so maybe carve out any excess when it's not fully cured. Either way, fixed the rattling thing. I'll update if anything changes.