I used:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Looks like yours has two wires for one on the always on fuse and another for the ignition switched on fuse. Not sure why that is but maybe has to do with the Rexing units? Mine is always powered on that #6 fuse and I shut it off at the unit itself when it's in the garage.
It can be left on though without draining the battery as it only starts recording when it sees motion or it senses movement. Sometimes it's days before I drive but anytime somebody goes in the garage, it starts recording so I just just turn it off manually while in there.
That cable pictured there is all you need. Power from fuse wire and ground wire to metal on car. The hardest part of install is just running the wire through the car up to the top of the window.