The S12 auto TPS is simply 2 switches in one. It provides a full throttle signal and an idle signal, with no variance in between.
If you use an S13 one, it has an additional plug come from the rear of the the unit then provides the variable signal.
Only issue, is that you may need to supply 5v (guess) to it for the signal to be similar to how it would be on an S13.
The answers to your problem are in the S13 service manual. Rather than look at the wiring diagrams if you look at the tests for the TPS it should show the switching side and the potentiometer side of things.
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