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why doesn't electronic gas gauge work? How & how much to repair it? on 1997 Cadillac DeVille

Has not worked since car was purchased used with less than 50 K miles.

Most likely the sending unit in the gas tank.
Thank you for your answer and help Professor G!
Will have my mechanic check it out.
Again Thanks! stormy 10000
1 more answer , 1 more comment
HAVE SOMEONE WITH A TECH 2 SCANNER DO A GAUGE SWEEP TEST TO MAKE SURE THE GAUGE IS GOOD FIRST THEN SUSPECT FUEL SENDING UNIT OR WIRING
Thank you so much for your answer globalhelper! My mechanic is pretty "up" with new technology so will have him check it out. I am rather tired of using my trip mileage indicator to "guess" how many more miles I can travel, based on mpg average.
Again many thanks!
stormy10000
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