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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.
My car used to do that, once I cleaned all the sensors, IAC, EGR, etc, and added a new maf and tb, it stopped. Never knew what it was, but hear it is a common occurance.
Yes it is tied together, it can cause your speedo to not register correctly, cruise control not to work, etc. It is the actual connector for the speedo cable on the tranny for a T-5 car. It has one electrical connector on it, the entire unit unscrews from the tranny, you can get one off of 50resto.com
Mine is bad, and my speedo is not working but my cruise still works..