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I did notice that my speed signal wasn't very strong. Less than .5 volts
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O.k., duh, I just reread your post. I get like 2 VAC at the proper .8mm gap. Every tiny distance you move that sensor face away from the flywheel, the AC current generated by the sensor drops off exponentially. I tried this once by mounting the speed sensor to the toolpost holder on my lathe, and moving the face closer and closer to the chuck face. Got up to like 3.5V with the big chuck teeth and almost no gap.
What I was getting at in my previous post was that even though your graph looks different, it could be just displayed different (duh) even though peak to peak measurements are really the same, so we need to see values...