Really can't help you with that, it came as a kit with the sensor and the gauge.I hooked everything up as a "harness"
Actually used a heated o2 sensor plug from another car, hooked all grounds together, left the reset and led on the controller side of the plug, on the car side of the plug, spliced in to the narrow band, egr, power and ground.thus w way all I have to do unplug the"harness" reattach the narrow band. Thus makes it portable.