The most important thing to consider when changing your risers or handlebars is how much the overall height changes versus the stock riser/handlebar setup. Often, if your new riser/handlebar setup is similar to the stock ones, or within 2-3'' taller, your stock cables and wiring will work.
Cables and wiring can sometimes be re-routed a bit to give a tiny bit of extra slack if needed. If the new risers and bars change the height considerably, you may need to get extended throttle cables and a longer clutch cable, and extend your wiring by splicing in additional length. It takes a bit of effort to get that custom look, but when done right the result is well worth it!