Help with connecting headunit to reverse camera
 

I recently purchased an Atoto A6 Pro to replace my 2016 Subaru BRZ oem headunit.

Everything is working great, although I'm struggling to connect the reverse camera to the new head unit. I know there's a reverse wire from the head unit that needs to be spliced in the reverse trigger wire from the oem harness, but other than that I'm not sure what to do.