Right at the dehumidifier (filter) there is a pressure sensor, right at the sensor there are 3 wires coming in, I know I can fool the sensor (if it were bad) by putting 2 wires together but which of the 3? Why is that in any other car I have seen there is only 2 wires at the sensor not 3 like this one? Can someone help me identify the 2 I'm looking for?