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I got this and wired it to an ignition controlled fuse in the left of the dash.

http://www.amazon.co.uk/gp/product/B...r_1_12&sr=8-12

My cam is this one,

http://www.amazon.co.uk/E-PRANCE-Nov...ds=eprance+g1w

It just plugs into that socket above and all nicely hidden behind the glovebox. Have some spare usb sockets aswell for future fiddling.