I'm about to order an Aeroforce gauge for my 04 Comp G, but I'm looking into how to hook it up and I'm getting conflicting information. Some say it's plug-and-play to the OBDII port, others say you need to wire power to it. What does it take to install one of these in my car? I don't want to wire in a wideband setup or anything, just monitor KR. I know this has probably been answered dozens of times before, but I've found 3 different answers.