Just doubling back on this Paul since having hooked up the red wire as per your images... Does this function correctly for you?
I can't reconcile this with any wiring diagram I have which seem to imply the wire is Black as per my vague recall and comes from one of the relays (which I now find attached to the unit just refitted).
In short then my reading is the Red goes to the oil sender and Black from the round overdrive relay to the reverse switch?
Confused!
Jim
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