stemco in door jam?? what is this

[harveyracing06]

just got a truck and the person whom had it before me had wired the elec fuel pump to this stemco item in the drivers side door jam anyone know what this is? it is just to the left of the door jab switch.

[BobbyFord]

TRS ambient temp sensor: http://www.fordification.com/library/ma ... temId=6324

[harveyracing06]

wow thanks your the man!! this is the best website ever!