And to cactus Bob, sounds like you have the Ford "rotunda" version of this same thing, if it's the magnetic pickup kind. To my understanding there was one set that used a luminosity probe, and another that used a mag/piezoelectric pickup. This is essentially a copy of the rotunda pickup type.
I realize I've fallen off the wagon here, so if either of you guys want to snag my place in line on this one, I will understand and bow out. If not though, I do plan to jump on it asap.