WARNING: This page is about a different car, the 2005 Subaru Baja. However, it is still accessible from the selected car via links, so may be relevant.
Install in the reverse order of removal.
NOTE:
Replace O-ring with a new one.
Tightening torque:
1.6 N.m (0.16 kgf-m, 1.2 ft-lb)
Fig 1: Installing Pressure Sensor To Throttle Body