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If you have already bought the repair manual for this specific vehicle, it will tell you in Chapter 1 what the gap should be on the spark plugs. This is a per specific vehicle/ engine.
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I'd use the type spark plug recommended by your owners manual, the manual may also give you the gap. There may be a decal under your hood that gives this info. Anywhere you buy sparks will have the gap in the info. For one ngk plug I looked at, it said .043in gap.
Different spark plugs manufacturers may have different gap recommendations.
the spark plug gap for gmc sierra with the 350 ci 5.7 is 0.35 Im not sure what it is for the other motors but if you have a 350 in a 1993 sierra its 0.35 I know this is correct because its on the sticker under my hood and im changing my oil right now so I just read it about 20 seconds ago....
im thinking .50mm but im not sure about that to check look under your hood on the little white sticker with the engine specs on it and this should tell you what the gap is.
if your audi uses a platinum plug (which im almost certain it will based on the year and manufacturer) platinum plugs come pre gapped and do not require gapping
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