On first gen probes the VSS is mounted in the gauge cluster and internal in the speedometer assembly. That's of course assuming you have the analog gauge assembly, which since you have a GL... you do. The Digital equipt first gens (like my LX) have the VSS, or vehicle speed sensor, mounted on the trans with a two wire connector. All of the analog first gens have cable driven speedos, whereas all of the second gens have the VSS mounted on the trans with a two wire connector because even though they have analog gauges, they are all electronic.
Just FYI... so check the cable...
Too many cars!!!