One of the neat options that was available on the Boxster was the on board computer (OBC). This computer adds additional functionality to your gauge cluster: Range on remaining fuel, outside temperature, speed alert/gong, average fuel consumption, and average speed calculations. Many cars were not equipped with this option, but fortunately the programming and circuits are built into the gauge clusters. To activate the on board computer, all you need to do is to install the turn signal switch with the control stalk, and have the OBC functionality enabled by the Porsche factory programming tool (PST-2 or PIWIS).