Okay, this is another crate install issue we ran into this weekend. We pulled two sensors off the 85 305 block. One was in the head between the front two plugs a little above there centerline, closer to teh centerline of the headers. I believe it was in the driver's side head. The second sensor was down low in the block, just above the oil pan on the opposite side of the engine. I am assuming one of these is the oil pressure sensor and the other is the temp sensor. The one down low on the block cracked when we pulled it. The guy at NAPA said it was a engine knock sensor? My truck had ESC originally, but is this true? He said if I wasn't going back with ESC that I didn't need it. Where is the temp sensor and the oil pressure sensor? I would hate to blow this sensor off and not have my guages. Brian Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!