This control box was in my friends 93 GT when he bought it. It plugs into the ECU, but when we disconnect it from the ECU the car will not run at all. I had thought that it was lke anything else that piggy backs the factory computer that if it is removed the car will run off the factory computer. The pics are a little blury. the first pic of the box says on the front SVO Motorsport. The dial on the left say AIR FUEL above it, and the one on the right says RPM LIMIT above it. The 2nd pic is of the back and you can see the style of the the plug. We would like to know what this box is and what & how to use its funtions. I havent been able to find and info online. Any help would be great.