I was breaking my head trying to figure out the same sensor on my cutlass not long ago. I couldn't find the connector for it on my car and every parts place would pull up the 2 prong style. One day while repairing my harness I removed all the wire loom and found a 2 prong connector hidden inside. Got the 2 prong sensor plugged it in and it worked. Still haven't figured out why there was a 1 prong sensor but no connector for it.