deville manual

Looking for a 1991 deville manual. Just recently purchased a champagne deville brown rag top and didn't realize the depth of cadillacs sophisticated tecnology. In need of a manual for this car to get a better understanding to what is going on wit these codes and L standing for E (empty) i don't even know how many gallons of gas i have if any.

Your best best is to try ebay for a service manual for your cadillac.