switch on the wheel? you mean adding the stock button on the end of the headlight stalk?

when you buy that part, it is the entire stock that bolts to the column, if you get one with the for option it has provisions on the harness connection for the added wires. Then you either have the wires in the column, or you add them to the connector to get them to the lights.

This turned out to be an expensive option for me, so i added a factory acceptable looking switch to the spot where the power mirror switches would have gone.