A gauge has a face plate which includes indicia thereon to indicate specific values of a parameter. One of these operations may include, in response, at least in part, to a request to store input data in storage, encrypting, based least in part upon one or more keys, the input data to generate output data to store in the storage. A phosphor selected from europium-activated halophosphate phosphors and europium-activated aluminate phosphors is used as the blue light emitting phosphor.