A photoreceiver assembly for accurately separating at least one low level, high frequency signal carried from a large, low frequency pulse. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention. The assembled first, second, and third housing components define a nonlinear vapor flow path that redirects vapor from the first valve to the second valve, thereby reducing an overall height of the vent valve assembly. Control of the process is based on the same model during normal operations, during process-upset conditions and also during a recovery period after the upset has been addressed. The display is mounted in the handlebar cover and the mounting is done in a way so that the display can be mounted from above and still provides a neat appearance for the finished product.