Found this while reading a website about a new hub-less motorcycle. It a new product called
ScanGauge that plugs into the OBDII port and monitors a bunch of parameters like voltage, intake temperature, coolant temperature (oil temp in a 993?), tc. Allows you to reset the CEL, too. For $130, seems like a pretty good deal. 993s have issues with the CEL coming on, don't they?