I am trying to figure out what sensors these are. On the left side of the blower(would be right if you were looking at it) There is a bracket that has 4 sensors mounted to it. I know the first 2 from the front are for the EGR, but what are the last two?

Here is a picture I found of the bracket, and they are the last two on it:

 

One has to due with the boost dump valve. The other goes over to the vacuum evc by the brake booster. Not sure if this helps you but if i was at home I'd look for ya! Artie

 

Yeah; the second from the back is for the boost bypass/dump. But, what is the little one in the very back for? It has 2 or 3 wires going to it, and has a optical sensor looking thing on the bottom.