The previous owner more than likely sold it on ebay for a few dollars. You can cycle through the different options by turning the key to on without starting the car and hit the up and down arrows. The instructions on the cluster are self explanatory and easy to understand. It would be a good idea to try and snag a manual.
Here is an easy way to obtain or view your manual on line.....
Go to >>
https://www.mygmlink.com Register your car, it's free. Once you are in, click on the "glove box" link on the left pane, you can view your manual on line, or purchase one. You can also obtain a service manual there as well.
