wiring up the dx to si when I noticed that there is a sensor of some sort on the back and towards the bottom of the intake manifold with two wires blue/black and black and a plug comming off of it. The plug won't fit anything and I can't find any information on it. It looks like it measures pressure in the intake or something. I looked at a few sites with pictures of si engines and didn't see this part on most of the manifolds. If anyone knows anything I would appreciate it. Otherwise I will just see if it works without pluggin it into anything.