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I believe that guage is actually for the alternator. Like most Ford "guages", it's probably not a real guage, but more of a fancy "idiot light" programmed to only move when there is a problem with the alternator. When the "guage" is in the mid-range, everything should be functioning properly.
if it was at the full line you would have a serious problem and the "fancy idiot light gauges" go for all the ford gauges but the fuel level.you can never tell what is what on those gauges.
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