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Here is a pic , IMO, the boost gauge won't be as effective as a Ross tech Vag-Com. You can datalog requested boost vs. actual boost to check if the actuator is adjusted properly. Of course, there could be a boost leak or faulty component that can screw with the datalog but a boost gauge will move too fast for you to accurately track all the readings, rpm, etc., while doing a road test. Recording these values and then sitting down when your not moving is the best way to check it!

which way for more boost ?
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