dxw00d:
The diagram on your first link shows where the Ground, 5V and Analog Inputs are on the shield. The picture on the second link shows which connections on the sensor board to connect to Ground, 5V and Analog Input 0.
yes, based on the diagram, i think it is in the same analog input which is in analog 0 as i can see, the gsm has analog input of 0-5 and in the gas sensor is in analog 0, any alternative connection of this three devices?