I want to install a ham radio and/or a scanner into my 2016 Chevy Volt and was going to use a Micro2 fuse tap, but what slot number should I use on the rear fuse box? I'd like for it to power off when the car is turned off. Thanks

We have all seen many posts on this forum about obd2 readers, leaving them connected to the OBD2 port and gaining all kinds of information from the Volt. What I cannot find is this : Is there an OBD2 reader or scanner I can purchase that will give me the same info that OnStar can give me when...