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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
i had a problem with my temp and gas guage climbing at the same time. i just installed an autometer temp to be sure and it's more accurate, but if your not looking to spend the 50 bucks it might be a grounding issue somewhere causing it to act like that.