I have found the best way to change this sensor on the 318cid model is from the top. I removed the transmission crossmember and jacked the transmission all the way up to gain more space behind the engine. You will find the sensor on the right side, follow the 3 wire harness and unplug it. Then using a couple of extentions and swivels you can reach behind to feel the bolts and guide the socket on to the bolts. I could not see the bolts at all it was done by feel. Remove the bolts and sensor, then reverse this procedure.