Neutral safety switch

I have a 68 Dart , original 318 is gone. Has a 1975 360 in it and not sure what transmission. Here's a pic of the pan on transmission. I'm told the neutral safety switch is just above the pan on driver's side. A 3 prong plug but all I have is what looks like a temp gauge with a threaded end. It was a column shift n I moved it to the floor. It will start in neutral but not park.

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