I found it here: http://www.explorerforum.com/forums/showthread.php?t=207905rwenzing said:Ford used a Hall Effect CMP from 96~98 and a Variable Reluctance Sensor CMP from 99~01. Each takes a different alignment tool. For identification purposes, HE sensors have 3 electrical pins, VRS have 2.
The thread deals with synchronizing the Explorer cam position sensor but I found the above excerpt to be interesting.
I'm posting this in both threads.