I have a 92 GMC vandura van with a 4.3 litre v6 engine. I am trying to figure out names of some of the sending units on the engine. I know where the temperature sending unit is located. But there are a couple that I am not sure about. One is located on the driver's side of the engine towards the back between the tworear spark plugs. It is installed in the engine. The other is right in the back justto the right ofthe distributor (again the driver's side) and is larger in diameter. Would appreciate the help.