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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 think I finally found out I have bad gauge. I just installed a new 180 t-stat, and a new fan clutch. The gauge was reading 250 before the t-stat even opened. Crap, now its time for autometer to get a call.