I asked the M&H guys about this on a harness I had. I bought the extension harness that goes to the sensor that is mounted in the head on the drivers side for the temp gauge. The extension harness leaves the 3-pronged connector available so that you have both of them hooked up. They said that the 3-pronged sensor was also part of the TCS system. Here is a pic of the extension harness, it looks like the single wire on the bottom is what goes to the other sensor, so that's the one you should use. I haven't received my harness yet, but here is a pic of it from their web site.
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