Reverse +12V Signal

[lostgt]

Hi, Pls can someone advise me on where I can tap a +12v reverse signal ie. when reverse gear is selected?

Thanks.

 

[Dan!]

When I put a reversing buzzer on a work van I just ran it off the reversing light +12V if this helps?

 

[Scotty]

I think that could be the only way. I think everything else will be CAN bus instructions.