To anyone driving with a Boost controller...pls educate me on its is uses e.g. can it be set at low boost for town driving and at high boost for fast road use?

Do you need a boost gauge to go with it?

Some type of boost controller has a built-
in boost meter and is digital,thus more accurate.Yes,you can adjust the boost level ie low or high.Got to be cautious when setting at high boost due to ECU cutting off fuel and ignition to engine at boost beyond the factory setting.