2005 xlt Connector ...need to know where & what it connects to

[Teej001]

2005 XLT. Due to several operations had to have someone install a rebuilt engine, turns but no start. He did not know where 2 conn's went!! I found a sensor for one ( but do not know where it mounts...it's a 2-wire) the other(3-wire) I'm having trouble finding it's other end.
I will sincerely appreciate any help