If you’re upgrading to a double-din stereo, I recommend paying extra and getting the iDatalink Maestro. It shows check-engine problems, and gauges, door opened or closed, radar detector, 0-60, etc...
X2 to this. I highly recommend using one of these with any aftermarket head unit install. They aren't priced bad, and you get a whole lot of cool features with them:
It allows you to view multiple gauges on your double-din radio, like temps, speed, load, timers, acceleration. Also, it shows if your doors are open and closed, vehicle diagnostics, 1/4 times, tire pressure, 0-60, etc...
Look at their website to see everything. Its just something else to spend money on but I enjoy it. Almost every new aftermarket double-din radio will work with it.