I never got it working with the factory sensor and a converter. theoretically, there is no reason why it won't work. After I shorted out the first converter, I decided to get the bluetooth adapter and GPS from EFI analytics.Bringing this one back from the dead.
Were you able to get this figured out? I have the same MS3X, and I'm wanting to hook up the factory VSS as well.
Yes, the factory fox sensors, at least for 1990, are VR type sensors. I read a post about the triggering wheel having 8 teeth but I haven't confirmed it. I used 8 for the setting but might need to modify if speed readout doesn't match the gauge cluster.very cool. Is it a VR type?