This is an AEM wideband controller. It's missing a sensor and just needs that and there is an LED that went out. Hence the price. Though I am selling this in a boost controller and the two gauge a-pillar pod from ZZP as a set in another post in the classifieds. The boost gauge actually has the sensor of the wiring and everything with it. This gauge has the wiring and everything else required to install it and run it. It just needs the sensor itself. I even have the extra faceplates and bezels for both guages.