I recently purchased 3 bar map sensors and was wondering what screw do I use for the Tmap on the cold side pipe?

 

They can only go in 1 way. There's a small piece that needs to be cut off in order for it to seat flush on the pipe.... and you should be using the screw closer to the passanger side of the car (screw closest to the a/c compressor)

I would take a pic for you, but I'm at work and the car's at home.