The Haltech CAN wideband O2 sensor kit includes everything you need for plug and play operation when used with a Haltech Elite ECU. Simply connect the CAN-bus cable between the WBO2 controller and the ECU, and connect the sensor(s), and you're installation is complete. These controllers can also be used with non-Haltech or non-CAN-bus equipped ECUs when used with the included power harness that can be connected to switched 12V and also allows for an analog 0-5V output.
Basic controller kit allows connection to the ECU for logging and closed-loop O2 control. A gauge should be added to the kit if you need an external display. If you're pairing the controller with a display dash, a display gauge would not be needed.
Single sensor kits include controller, harness, and one (1) Bosch 4.9 sensor. Dual kits include controller, harness, and two (2) Bosch 4.9 sensors. Gauges, single or dual, may be added to allow AFR to be monitored in a 52mm gauge format.