OK Sorted out Composite video output (normal yellow video lead output) as this unit does not have one, only HDMI and component (red blue Green plugs) so it will need standard video to run in standard car screens.
To get apple tv to work with Composite video plug in your video lead to the green phono output on the back,
2 ways to do this
1- flash tv and then install nito tv and composite video plugin.
Assuming you have nitoTV installed properly and 480i selected.
- go to nitoTV - Settings - Utilities - Kernel Extension Manager - TVComposite.kext - press the Play button -> you should see color immediately
To add it to startup, press the Fast Fwd button and then Create Startup Item
(Thanks atvnoob from hackint0sh org for that tip)
2-The other way if you don't have flash installed is an HDMI converter and another converter for this way I would google it as i did not use that route
Trying in the car later today (hopefully if kids and my wife don't side track me)