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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.
Alright fixed it. I just hooked the wires directly to other wires instead of going to the fuse box and made sure the ground was good. Thanks for all the help.
i had that problem at first also.. but i find it annoying at night to have the tach light on. so i have that disconnected. the only time i really use my tach is at the track or racing so it doesnt bother me to not have it at night