We have a 24, installation might be different. Hansshow provided a harness and there was no tapping into any wire. Just the adapter harness at the passenger footwell and 12v power from the battery in the frunk.
Not in Chicago but I just installed the step in my wife's Gen1 R1S. They are nice and smooth, open quickly and feel sturdy. Only had them on for a couple of days, so cant comment on longevity.