I would get the 20 wire harness...33205-ZY6-020AH (20ft). If you need a 25 ft cable then the last numbers would be 025AH. A 30 footer would be 030AH. I think you will find it is probably cheaper and does more than the harnesses that you listed.
I think the key switch panel you ordered is an older still, that is not sold by Honda anymore. It probably just has an overheat and an oil pressure light.
You should also install a PGM light panel which is a check engine light and a charge light. Its number is 32340-ZW7-000AH. It runs around $30. It is useful to let you know when there is a sensor or charging problem.
The harness mentioned above, has all the wiring needed to handle the PGM panel (just plug it in).
Mike
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