I found something intersting that may help me:
All the pins are used! How can I connect anything to the Arduino??
We suggest using a protoshield (with stacking headers) or a proto-screwshield to access the unused pins (2, 3, and analog 4 and 5). You can connect various i2c sensors or analog sensors to analog 4&5. You can also connect an i2c port expander to get more I/O pins. If you desperately need more pins, and you're careful, you can use the 8 datapins while the TFT isn't being written to - they are high-z and unused as long as the WR and RD pins are high
My sensor uses 5V, Ground, 2 Anlalog Input, RXD and TXD. There's no problem getting the 5V, Ground and Two analog pin but i don't know if RXD and TXD pin are used for my bluetooth module...