My truck is using the virtual sensor. It seems to be working ok but I want the actual sensor. I ordered the sensor and everything to plum it in before the fuel rail.also ordered the plug and what I will need to add a pin to the ecm Molex plug..there are 2 plugs on the ecm.which one do I use and it is pin 40 right? Where is the best place to grab 12v from and does it have to be switched 12v