With many low cost widebands to choose from we have discontinued our WMS Wideband and choosen the AEM as our favorite replacement. The AEM uses the same Bosch calibation technology for very accurate air / fuel readings. This is a complete kit with 2" round gauge / controller, Bosch LSU 4.2 sensor, wiring harness and even a bung included. The gauge comes with extra face plates and bezels so you can make it a black or white face with black or silver bezels to match other gauges. At this price you can't afford to be without a wideband!