I have just finished building a Jaycar Mixture Display 'LED Bargraph type' and was able to get a signal of the black signal wire off three wire EGO and just ran the power up wire and ground for it to the battery just to test it would work and it does......What i can't wotk out is that the other two wires (both white) on the EGO seem to be grounded and have no power at all which is odd because the they should have to allow the EGO heater to work! My car is an EB Fairmont and the loom connector has the three wires in it so i'm confused as to how the Sensor is working at all as it surely needs power in and then the signal out??? What am i missing???