As you’ve undoubtedly heard already, the central binnacle of the Saab 9-5 dashboard houses the Saab Information Display (SID), where the driver can access a range of information about the car. I’m not sure, from memory, if the SID terminology is still being used, but it’ll do for now.
Control of the information shown comes from a rotary dial on the stalk to the left of the steering wheel.
Following are the various bits of info that can be displayed. Click to enlarge.