Hello, I am fitting a pair of 850 knock sensors (PN 320523654778) to a completely different engine. Can any of the resident gurus tell me which pin on the connector does what? I have the later version with two wires leading back to a common connector that has three pins. Since I have heard that these engines retard individual cylinders I guess that each sensor has a common feed and two returns. Am I right, or more wrong than Anne Widdicombe's chest, poor lass?