My grandpa bought a very well preserved 1992 s10 the other day. The coolant temp gauge does not work (as in it always sits on zero degrees), I did standard test of grounding the green single wire and watching the gauge jump to high, and drop back down when I removed ground.

The plug is the same as the other temp sensor for the ecu, but with one terminal instead of two. I've tried looking online at the parts stores and at acdelco, but never found anything that specifically said "one terminal", and the only pictures I saw showed either two vertical terminals or one vertical and one horizontal terminal. I went to Napa today and the only thing they said they had was a two terminal version.

Does anyone know for sure what the acdelco or Napa Echlin part number is for this sensor with ONE terminal?