And some clear nail polish.
Follow this guide:
While its apart I'd recommend the led dash light mod.
I have it done and its a very great improvement.
When you pull your instrument cluster out, removed your PCB and sand it lightly. If the copper is green sand it down. If there is no longer a connection, use the defogger repair and with a steady hand redraw the line.
After you get it all done, smother it in clear nail polish. I did this because of a pesky windshield leak and the 3rd time I redrew my board I said enough is enough.
Clean all contacts thoroughly and you'll be golden.
I reinstalled my PCB while the nail polish was tacky so hopefully it would set to the curves behind the cluster.