Includes pic. There is 3 prong clip the plugs into what I believe to be egr blow off. I hav e the clip but lost the paper In which I wrote what color to what pin location. The wire colors are grey/red, brown/wht, and brown/grn. Truck is a 98 4.2l v6. Thanks for the help

 

It does not blow off anything.
It does not control anything.
It is a "reporting" sensor.
It reports the difference between the input pressures from the small rubber tubes attached to the larger metal pipe.
Look at another truck with the same motor to see the color codes.
Good luck.