I would proceed a little differently. Since the spacing between the sensor and the magnet on the cam gear is critical, I'd unplug the connector and insert some very fine wires into each pin position (just individual strands from a scrap piece of stranded wire), then refasten the connector. Don't force it if it won't go back together. Keep strands separated so there are no shorts. Then use your voltmeter and try to detect the signal pulses each time the magnet goes by. I'm not sure, from the diagram, which two pins you'll find the signal on and since it is a narrow pulse, the meter will probably just blip. Looks like I'd connect the ground of the meter to Pin 1 and the positive lead to Pin 2 for starters. (Make sue Pin 3 is carrying +12 volts with respect to Pin 1.) This would at least give you an indication that the sensor was or was not functioning. Good luck.