B6 Reverse Signal input ?

[skcoombs]

Hi Ive got an aftermarket Pioneer Da120 in my B6 Estate, wish to add rear reverse camera but need to connect a wire from the head unit (reverse signal wire) where does this go, i know what its for it switches the cam on when reverse is selected im thinking to connect it to the reverse light wire ?

Anybody got any ideas or past experience??

Thanks
Stephen