Paired sensors

[Lurkily]

I'd like to be able to pair certain sensors so they each detect whatever relative to their paired block.

For instance, two directional sensors would always point to each other.  Two speedometers would detect each block's speed relative to the other.  (Read the delta between their speed instead of the speed alone.)  Altimeters would read zero when they're both at the same altitude, but if one was ten meters higher, one would read -10 meters, and the other would read +10 meters.  

The only thing I can't see this working for might be things like detectors, which are just on and off.  Any interaction needed can be done with logic.

A pairing like this would make it possible to have separated drone parts act with coordination, and would bring a new level of self-awareness to drone control.  You would be able to logically begin and end processes when parts are aligned (jaws are fully closed, stop closing buzzsaw jaws)