What car you going to install.. If your current car have steering button you just need a set of wiring adapter to match your factory HU socket and with this you can PnP only without cutting any wire.. I will go for Kenwood for 3 camera support coz doesn't need to add switcher to change camera..
Can check here which type your factory HU socket type..
https://www.kenwood.com/au/car/visual_navigation/oem/

This post has been edited by Oldskolboyz: Oct 12 2020, 01:03 AM

You need wire harness to match back your factory hu socket.. coz steering button wiring -> Clock Spiral (Upper socket) then Cock Spiral (lower socket) -> HU socket.. wiring is there edi.. you just need wire harnes match to this socket & the other end match with new HU socket.. just like HDMI - WGA adapter cable, you need this adapter when your laptop have HDMI port & Led Monitor only got WGA port.. this also apply to car HU unless you dont mine to cut factory wiring/socket..

Support 3 camera mean that HU got 3 camera input without need additional switcher.. If you have 3 camera (Rear/Front/Side).. all this camera can connect direct to HU & at HU got CAM button where you can select which camera you want to see..

This post has been edited by Oldskolboyz: Oct 12 2020, 05:00 PM