All the big DSM tuners (Road/Race Engineering etc..) think that the S-AFC is pretty swell, according to their website. They even provide starting tuning points for DSM cars w/different mods...
The S-AFC technical documents are on APEXi's web site, including wiring diagrams, and all the technical info one might need in order to hook it up, yo. Try the link at the top of the post for more info.
And yes, one has been hooked up and works very well on a local Mustang here in Denver! This should work for Contours...
Alex in Boulder, CO