To complete your setup you need an actual wideband O2 sensor and the wiring to get it to the gauge, then you need to drill a hole in the exhaust after the front O2 but before the cat and weld in a new bung for the wideband to screw into and then wire it up. Its not that bad. Check out the website for the gauge you have and see if they have the sensor part to complete the setup (I would assume they would if they sell a gauge for it). Otherwise I think AEM sells just the kit for the sensor that you can probably use (or return your gauge and replace it with a complete kit).