I was looking at the wiring diagram that came with the darkstars Click image for larger version. 

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They do what I was going to and switch both centre taps to ground, which I thought would create phase issues until I tested which wires went to where by wiring up a single coil and tapping the poles with a screwdriver. It turns out that these darkstar sets have the black wire on the north coil of the neck and the south coil on the bridge.