Not all Boxsters have dipsticks, so the common way it to make your own slack tube manometer and attach it to an oil filler cap. Remember that when the system is functioning correctly, you are only looking at a vacuum level of 5 inches of water, which isn't much, hence the homemade manometer............
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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