Nothing to worry about...they seem to read accurately during boost and vacuum. The VDO I used to have read that way with the car off the day I installed it. It also rattled like crazy when coming off boost slowly. I've since sold the car I had it in along with the gauge and got an Autometer "Z-Series" gauge (black face, black bezel) for my new car. After a week, no rattles and it still reads 0 with the car off. I question the accuracy of it as a vacuum gauge though.
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