Under the left hand side seat pannel there is the PGM II unit, this only has one 16 pin connector unlike the MC21. Use the same colours as the MC21 to derestrict the R5k and R6K, They are all comming out of the singe 16 pin connector. You dont have to worry about the GPS because the 18 doesnt have one.

Hope that helps you.
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If I have to take the carbs off once more...