Ah, right forgot about your SS700 speedo drive.
My GM mindset showing

May be some help, also offer 2/K adapter.

http://www.ebay.com/itm/90-92-TPI-Retrofit-Style-VSS-Speed-Sensor-4000-Pulse-/370956316601?pt=Motors_Car_Truck_Parts_Accessories&hash=item565eb82fb9