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1999 sable temature gauge not working changed sending unit does it require both of them to be changed as there are two of them together

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Is this what you have? The top picture is 2v. I looked at wiring diagram for your instrument cluster temp gage, saw one sensor, one wire connector, wire color red with a white tracer. Take connector loose, key on, use a digital multimeter, check for voltage on the wire. If no voltage, something wrong with wiring circuit or the instrument cluster. In my opinion.
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