Hi, I have a sapphire Cosworth and I bought a narrowband Air/Fuel Gauge and a 3 wire Oxygen sensor to I connected the Red wire of the gauge with the red wire of the oxygen sensor together to an ignition main, the gauge and sensor black together to ground and the violet of the sensor with the gauge. Whenever I turn on the headlights the reading shifts two LEDs to the left. the sensor is only connected to the gauge not to the ECU. What could be the because an electrician told me it could be the gauge or sensor are faulty but they are both brand new.