First, insert, or twist (in 2001 and up C5's), the air temperature sensor into the knee plate (if you have Dual Zone A/C installed in your C5).
 

Like so.
 

Then, attach the air temperature sensor wiring harness (again if you have Dual Zone A/C installed).  It should snap into place.
 

Now, slide the knee pad back towards its factory position.
 

Gently pull the console panel away from the dash, allowing the knee plate to slide up underneath it.
 

Continue working the knee plate into place.
 

Until the tab from the knee plate slides into the hole in the dash.
 

Then give the driver's side of the knee plate a push, with the palm of your hands, inward and upward.
 

Tuck the rubber piece of the knee pad behind the steering column.
 

Then, replace the air temperature sensor torx screw.
 

And snap the air temperature sensor plate back into place.
 

Like so.
 

Next, pull the trunk release/fog lamp wiring harness from the dash.
 

Connect the switch plate.
 

Replace the the torx screw.
 

And snap the plate back into its factory position.
 

Like so.
 

Then, reattach the left side torx screw at the bottom of the knee plate.  There is a clip under the knee plate which the screw attaches to.  Be careful not to move this clip out of position while reattaching the screw.  Otherwise, it may move out of position and you'll need to squeeze your left hand under the dash, to reposition the clip while starting the screw with your right hand.
 

Then, attach the last torx screw to the right side of the knee plate.  The same rules apply to the right side clip under the dash.
 

Be sure to take all your tools and instructions out of your Corvette and vacuum it clean.