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Centre positive. IIRC, it's a 2.1mm jack.
As for rating, normally, I'd aim to exceed spec by a margin, but having said that, I've never checked the after-market one I own, and it's probably not much yet works fine. I've usually found JayCar products to be (on average) slightly better than Dick Smith.
EQ6 Pro draw while sidereal tracking is ~1A, and peaks at ~2A when slewing at max rate. I would expect a 1.8A continuous rated cable would be OK.
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