Hey guys, just a quick question...while putting on some headers on my truck and replacing the spark plugs i accidently clipped a sensor that was sticking out of the side of the engine and i dont know what it is and now i need to replace it. Its a 95 gmc sierra and the sensor was located right above the stock exhaust manifold on the drivers side more towards the front, and it has a single wire coming out of it. any help would be great...thanks