I didn't till I fitted mine.
It was quite fiddly because I took a power supply from the reversing light, which is on the car body, and the camera is mounted on the tailgate, so the wires need to go through the rubber housing the connects the two.
If you've got the new Medianav I think you can plug it into the back and get a display on the screen. I don't so I had to fit a screen too.
There is a step-by-step guide here: http://www.daciaforum.co.uk/forum/tutorials/article/33-no-drill-wireless-reversing-camera-and-rear-view-mounted-monitor/