[North Ursalia]

Edit: the four pulse per rotation was the speed sensor in an Impreza that I was thinking about.

As for the abs sensor, I think I'll have to wait to get my SVX back from the shop and pull a sensor from that and one of my Imprezas. The resistance values for a 'good' sensor are similar, but I think it's going to come down to input voltage and the number of teeth on the tone wheel in the long run, and the manuals just aren't clear enough to say one way or the other, so tinkering is the way to go.