on a d16y8, the factory water temp sensor is located right around where the radiator hose from the top of the radiator comes and attaches to the engine. look behind and under it. there is a single wire going to it with a rubber cover on the end. not sure about the oil temp. but i do know that the oil pressure sender is located above the oil filter. you will probably need to take off the filter if you are going at it from underneath the car. it too has a single wire going to it with a big rubber cover on the end. do you attach an oil temp gauge here too? i have installed a water temp and an oil press, but not an oil temp.