I finished upgrading my Vantage Pro 2 with the Daytime Fan-Aspirated Radiation Shield Kit, and everything went well. It's a good thing I unplugged the rain sensor, because the console didn't stay in setup mode the whole time. I put it setup mode before I started, but when I finished about an hour later, the console was already back into normal operating mode. It switched back to normal mode all on its own. If I hadn't unplugged the rain sensor, I would have registered a bunch of erroneous rain gauge tips.
Thanks again for everyone's help.