After getting the correct harness, I finally got the new radio installed. I'm very happy with how clean and OEM it looks.
I was surprised that the radio turned on instantly....without even having the key in the ignition. It's not supposed to do that, right? When I hold down the power button I can hear the amp turning off, but I'm surprised it will turn on without the key even in the ignition. I recently put a new ignition switch in, but I get the feeling I didn't tighten it enough because I have to "push" the key while turning to get the car to start.