The temp sensor for the non enumerated dummy gauge is in the head. The units used for motor function, which is what the sensor in the sniper is used for, are right below the T-stat that controls engine temp. I'm guessing the drain plug is where it is, because without it much of the fluid will sit in the block if not removed. I didn't see a point in second guessing the engineers, as they could have put them anywhere, but they chose there.All my OEM temp sensors are in the head.