Isn't there ranger data gates? If there are, there is probably a distance gate.
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My SVN:Get dropbox and get 250 MB extra space: DropboxCode:http://divranspack.googlecode.com/svn/trunk/%20divranspack/
Oh, I just saw the E2 code =P
I've actually been playing around, and the best way I've found is to place an entity marker like was mentioned earlier.
Otherwise it just outputs the length of the actual laser ranger, I was after the distance between the receiver and where the laser ranger hits, so I can move around and the receiver remains in a fixed position.
I'd like to make the contraption that is on youtube...
YouTube - Gmod artillery with laser target designator
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