1) Not sure if you want to use that. I think that circuit only has power when the hatch is open. The Field service manual says it that circuit is powered through the BCM. I think an Accessory power circuit would be more appropriate.
2) No idea what wiring/connector did it give you for the speed input signal. The CS GTR gauges is just am obii reader, it doesn't output any signal. The odbii connector is under your steering wheel.
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