RE: Clicking noises coming from the dash...
For the clicking it could be anything on that car, could be the temp flaps moving, electronic e-brake engaging ect. Probably nothing to worry about.
For the start button it recognizes the key in about a 20ft radius, for instance if you get within 20 ft of the car you can open the door without taking the key out of your pocket by lifting on the handle twice.
On that note it will recognize the key in your pocket to start the car as well, there are two detents to the switch, 1st detent is like the "ON" position, if you push the switch hard enough to engage both detents the engine will start.
When leaving the car you have to hold down the engine stop button to lock the steering wheel.
99 Chevy Silverado Z71 6" rough country lift/W 35" tires, 4.10 gears, (4.56 soon) S&B CAI and a flowmaster super 44 exhaust.
"Never argue with a fool, they will lower you to their level and beat you with experience." My personal motto.