im trying to figure out what are the two sensors on my moms car, 88 chevy celebrity wagon.  It has a 2.8 engine.
There are two sensors on the lower side of the block, opposite side of the starter.  
There is one that has a small one inch long shaft with a large circle thing on it, and only one wire  going into it.  The other, sort of looks like a plastic figure 8 with two wires going into it and it is held down by a small 1/4"? bolt, and two wires are  coming out of that one.  
I having some oil coming out of someplace near those sensors, its not leaking but just making the block oily.  And the manuals i have dont really get into detail about the other sensors besides the oil pressure one.
thanks