The Anti-Slosh module is located behind the instrument panel, it looks like a small card out of a computer motherboard. You have to disconnect the spedo cable and the two electrical plugs. I think it is on the top left side on the back. I have the same problem, just haven't gotten around to buying one yet. Priced them at Ford, about $70, but you could take your chances on Ebay, but good luck.
Also, when you take your dash apart, make sure you have some TORX bits, the top to screws by the windshield, that holds the instrument cluster bezel in place are tork bits, best bet is to go to Sears and get and set of TORK bits or a Key set.
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