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what do you mean jacking into the OBC? your not referering to the display that is located in the cabin are you? if so , its really not gonna do much, that only reads a few un-important sensors, (unimportant in terms of total disaster of the car)
what you could be referering to is actual DME, there is port located in the engine bay where you can plug in a diagnostic machine to run tests, prove faults and get overall performance of the car.
take a good look around the FAQ forum and see if any info in there will help you out.
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