If you don't already have a thermometer I doubt that it will work when you install the trip computer one. There's a thermometer sensor that is mounted up behind the front bumper that supplies signal to the box. Perhaps they are available from the stealership?

I would be surprised if the rest of the functions (mileage and fuel economy) aren't plug and play. I have a clock and thermometer, but have always wondered if the trip computer/switch would be plug and play. Please let us know!

If/when you pull the cluster to make the switch, consider changing the four cluster illumination bulbs. My experience is that one or more of the original bulbs will quit working during the process.