I would love to help, but it would be a guess
I would assume that you would power the new lights with seperate wiring from the battery going to a relay that would complete the circuit. Have a jumper wire from the factory back up lights to your switch and from the switch to the relay. that would be the first on position. second on position would be a a trigger wire from the switch to the relay for manual operation, and the "off" would keep the aux lights from working at all. Power your sensor light off of the power going to your aux lights, so when they have power your indicator would light up. I am sure some one with much more knowledge could draw you a schematic.
It may be easier to run 2 switches. One as a master cut off and one as a manual "on" switch...or should I say easier to wrap your mind around it.
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