The distributor has a 4 window hall effect sensor, which can be read by some fuel injection computers effectively as engine speed (though not as nice and accurate as a multi tooth wheel).

Controlling the CIS-E can be done, but no one has gotten there yet. We are taking a non-IT useable route on a production car, and for my 8v I would rather loose the extra weight of the CIS-E parts and gain the more readily available parts of the Digifant on my conversion, so I won't be figuring it out right now.