I bought the 360 degree cameras with it and so far they are working, so it’s not the original back up camera. I think the unit is just a head and runs into the OEM amp. I certainly didn’t buy an amp. The audio sounds clearer to me than it did when I was connecting my iPhone with an aftermarket Bluetooth module. Everything seems to work; radio, climate, defrosters. This said, I can’t find a screen that gives me the outside temp. I also can’t find the screen that has the tire pressure monitor readings. I got external sensors with the unit. Of course, the OEM tire pressure light on the dash is still blinking, as it has been for most of the 11 years I’ve owned the truck! If I were less lazy, I’d put a piece of duct tape over it. We were skiing most of the day so I haven’t explored it a lot. I’ll poke around the functions more over the next couple of days. I used Ways and my music library while driving today and it was easy and very handy. I stopped using the OEM NAV system years ago since it was such a pain in the neck. Here’s a pic of the unit in the dash.
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