I was looking into doing this mod for my tour. The ford dealer said there was a different connector for the window brake lite, Like a patch cord sorta. Total parts price to get 3rd lite in window and connector was around $115 new. You can find them in the junk yards for less just make sure you get as much of the wiring as possible just in case.
98 SE Sport. custom catback, Intrax springs, 3L, 3L valves, APEXi S-AFC, 24# injectors.
Other cars:
72 Challenger 360 motor 727 trans (used for parts)
73 Challenger 340 motor 727 trans 15.60 1/4 with bad miss and clogged fuel filter.
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