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Ford started using a small external printed circuit board, called an “anti-slosh module,” to dampen the fuel sending unit’s reading to prevent the fuel gauge from bouncing excessively due to vehicle movement. The ’87-’89 version attached to the back of the cluster via a mounting screw, while the ’90-’93 slid into a locking slot as seen here. Currently, the ’90-’93 version is the only one available, but if your fuel gauge is not working right, the failure of this module is often to blame. NPD carries it in its Fox Mustang catalog.