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There are currently 23 owners manuals for a 1989 Nissan Maxima in English on Ebay. The price range is from $5 to $15. Go to Ebay.com and enter "1989 Nissan Maxima Owners Manual" in the search and you will find them.
You only need to have the SID display the information (average fuel usage) and presse the CLEAR button for a few seconds (hold it) and it will reset to 0. When you start driving it will start avereging again. Any settins displayed with a stricked 0 can mean average and can be reset that way.