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by m1n1 3201 days ago
They open the pump face, unplug the back of the existing reader, plug the front of their skimmer into the back of the existing reader, and connect the first plug into the back of their skimmer.

It goes from ? --> reader

to

? --> skimmer --> reader

The face of the pump appears unchanged (unless they broke a security sticker and were unable to replace it)