I was crawling under the passenger side dash of my 1992 Mitsubishi Galant MPI when I came across this little black box labeled, Auto Comp Controller. It has two plugs going into it, one of which I noticed was unplugged. If you are looking up into the dash,it's the plug on the right with the four yellow wires coming out of it. The car seems to run fine, I am not sure what the box does, but is that plug supposed to be plugged in? What does this device do?