well a boost/vacuum gauge is not necessary but i like to have it because i use it as somewhat of a measure to see if my belt is slipping/giving out. i know some might argue with me on this, but for me the most important gauge for any boosted car is oil pressure. an electric oil pressure gauge with the Greddy oil filter adapter is gold to me a lot of people do air/fuel, but you have to get a wideband gauge which are expensive. and if the car is tuned, you shouldnt have to worry about a/f anyway.
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