i have a question as to what the extra sensor is on the back of my B16A is. Its the one with 2 wires going to it seperately. i read in other forums its for the fan switch for the radiator fans and read its the oil pressure switch? i know the one up top with the shielded wire is the knock sensor and i think the single wire sensor at the very bottom is the oil temp switch. if anyone knows that would be great.