Unplug the wire from the sending unit and check the wire for a short to ground with a meter. A dead short will cause the meter to peg.
Unplugging the sender with a properly operating guage will cause a "no reading" condition.
Steve
98 Contour SE Sport 2.5 Duratec ATX The wifey's car
89 Taurus SHO - 246K miles
94 SHO ATX - 190K
1997 F-150 5.4L ATX - The Workhorse 150K.
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