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Message: <blockquote data-quote="GMC4x4" data-source="post: 6826" data-attributes="member: 531">If it's tbi then you need an adapter that goes in place of the fuel filter to hook a gauge to. If it's a vortec then there should be a shrader valve on the fuel rail you can hook a gauge up to. Most auto parts stores have them and some will loan them.Edit: Just realized that I was on 800 forum. There is definitely a shrader valve on the fuel rail.</blockquote>