My bad biggy. I misread this paragraph from hydrogengarage.
Easy Installation, only 4 wires! Locate the OBD-II port, use the included connectors, or solder and you're done. Connects behind your OBD II connector's wires. You can still use the OBD II plug for any accessory, including the most excellent engine on board monitor, the Scangauge II.
I thought, "included connectors" was referring to an optional OBDll connector that came with the FS2. But it was just referring to the snaps.
My brain not smart sometimes.