There are three two prong pigtails and one spade connector not plugged into anything. They are located around the thermostat housing on my carbed 305 87 camaro. There are two sensors on my thermostat housing, if your facing engine, the one on the left is good and plugged in, the one on right is broken and I do t know what it is. Right next to thermostat housing there is another sensor in the intake that is broken and I don't know what it is either, please help!