Hheres what to do.... first, the sensor is NOT the two holes on the right. It was actually covered up by my skin in the upper LEFT corner. Since I already removed my skin to find this out I trimmed a rectangle away from that area and reapplied my skin. For you, I would peal away just the left corner and cut it with manicure scisors.
While my skin was off, in real bright light I could see the sensor through the blackness. HTH