The BMP180 sensor uses I2C protocol to read out barometric pressure values.
You need to connect the SDA and SCL pins accordingly (the Arduino's datasheet might refer to this interface as TWI or Wire).
Wiring
BMP180 pin
Where to connect
GND
Any ground pin (on Arduino)
3.3V
3.3V voltage source
VIN
If 3.3V not connected, connect to 5.0V
SCL
SCL pin on Arduino (for example, A4 on a Pro-Mini)
SDA
SCL pin on Arduino (for example, A5 on a Pro-Mini)
Title
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