Home › Google Analytic Question What are the three minimum campaign variables you should utilize to tag a URL using manual tagging? By · Wednesday, November 26, 2014 What are the three minimum campaign variables you should utilize to tag a URL using manual tagging? Answer- Source, Medium, and Campaign. Google Analytic Question GA Gaurav Arora, Digital Media Lead. 10+ years running paid media and tracking for brands in the USA, UK and Canada.