Automotive connector ID
I found Aptiv/Delphi #12065298, which is the same size connector as used on my LT1. Since it's at the back of the engine, it's hard to see (I was trying the switch by feel), but apparently GM used a 1-pin connector here with the other 3 closed. According to the datasheet I looked at, the pin measurements are the same, so the 4-pin version of this should work. The part arrived today and I confirmed it is correct.