Originally Posted by grpweld
Now I can't find the post that shows the pin orientation
When you look at the unit, you'll see that one of the four corners doesn't have a thermistor protruding through the epoxy. Choosing that pin uses the bike's internal temperature probe.
Going clockwise from the non-thermistor corner is -10, -20, -30.
Don't drop the jumper. You'll never find it. I carry a spare from an old hard drive.