SDA and SCL problem with MEMS
I2C is designed to have multiple devices connected. Assuming the gyro and accelerometer have different I2C addresses they can both be connected to the same SDA and SCL pins.

For more information see http://www.gammon.com.au/i2c

Naturally you can only "talk to" one at a time. You may need pull-up resistors on both SDA and SCL, unless the hardware already has them.