Speed sensor

I have an '06 M5 and the speedometer quit working. As it was just the speedometer I thought it might be the sensor on the tunnel side of the diamond drive. When I removed it one of the wires had rubbed through and was grounding on the chassis. I repaired the wire but it still does not work. The sensor fits in a hole on the back outside of the d-drive abd is held in place with a plastic pin. I "think" that the sensor is sensitive to its orientation in the hole but I do not remember what that is. The sensor barrel has one flat side. Is that the side that is supposed to face the plastic pin or does it not make any difference?

Sensor

Appreciate the pic. Different location and mounting from the M but thanks.

Sensor

Thanks D.
I was thinking that was probably the issue. Seems like a lot of $$ for what it is but $51 is as cheap as I have seen them. Thanks for the lead on the part.