Idle pressure should be around 1.5bar at idle and it should pin the needle something over 12-1500rpm when hot. As for the smoke technically a turbo charged engine should not smoke at all but since these engines are waste gated a noticeable amount of smoke is normal. A black cloud is not normal. Although, the old VW's could put out a cloud so thick the sun would disappear.

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Mark
82 300SD 110k
91 Caprice SS
92 Jetta TD
97 Cadillac Concours(300hp)
84 Celebrity 4.3L diesel