The (magic) chip connects to your IAT (intake air temperature) sensor, you can usually find it by your air filter. I do not recommend using this (as I've said) magic box because it is simply an expensive resistor that will make your car think it is running colder than it is, resulting in hotter running temps and wasted fuel.
Buy the Service Manual for the 1996 Ford F-350, and follow the instructions.
Or, look at all the chips on the firewall -- look under the protective covers, too.
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