That is a very clear breakdown, thank you. I’m curios though, are you able to see my picture? Yes, it’s four in-a-row plugs with the 2nd one being the obvious “controller”. 1, 3 and 4 are identical with only 2 wires, red & black. Given that the Bikespeed module only has two connections, one being for the controller, then I would safely assume that the the two-prong would go to #4, the Rear Wheel Sensor. Yes?