As of Release 2016a, Gauges Blockset is discontinued and no longer available for purchase. You can continue to use existing product licenses, or you can use alternative products.
In place of Gauges Blockset, consider using the graphical controls and displays included in the Dashboard block library in Simulink. This library contains controls such as knobs and slider switches, and it has lamps and semicircular gauges. You can add these blocks to your model to run interactive desktop simulations.