Something is obviously absorbing the vibration (i.e. pounding your fist) before it reaches the shock sensor. On my 99 Civic, my shock sensor was mounted on the bottom side of the steering column guard, and it too had a screw for adjustment. Mine was too sensitive at first, and could be set off by the wind, but I finally found a good spot.
If you keep trying and nothing happens, try to move it to a better spot, like against an interior body panel (like up by the hood release area, there's a lot of room). If all else fails, pick up another shock sensor and see if yours is defective or something.
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