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Don't know much about the 4 bangers, and my Ford manual only makes reference to the sending unit with a quick sketch, but it still may help.
One clue may be that the sketch of the sending unit was displayed "with the intake manifold removed for clarity." That would suggest to me that the sending unit is tucked underneath the intake manifold somehwere (duh).
The '99 4 bangers have a switch rather than a sending unit. It looks like the sketch that was posted. I guess I have more engine room crawling to do, or under the truck (again).