Already wired for I2C - no Need to convert
SDA: Connect to Gotek DISP_CLK J7 Pin
SCL: Connect to Gotek DISP_DIO J7 Pin
VCC: Connect to Gotek 3.3V J7 Pin
GND: Connect to Gotek VSS J7 Pin
Gotek J7 Pins:
https://www.ebay.co.uk/itm/0-96-I2c-IIC-Serial-Oled-LCD-LED-Module-128X64-for-Arduino-Display-Raspberry-JE/283404412540