Transparent OLED display with Arduino Mega

Hi, I'm trying to get this display: https://www.dfrobot.com/product-2521.html?tracking=XZvOz5z3NEqW1r78PKacowLPodJzloxpVgerUnLJM9RHX6DTAlGdHR2fSbrLOfiF to work with my Arduino Mega 2560.
First I tried following this: https://wiki.dfrobot.com/SKU_DFR0934_Fermion_1.51Inch_128%C3%9764_OLED_Transparent_Display_with_Converter_Breakout but didn't get anything on the display. Then I tried this way (with modifications tho, I'm only trying to print static text right now): https://www.youtube.com/watch?v=Ax4jlWFs_oA&list=WL&index=4 and all I get now is:

To what pins is the display supposed to be connected on the Arduino Mega? Is my unit perhaps faulty?
Any help/ideas are greatly appriciated <3
The display uses SPI, which on the Mega 2560 is not on pins 11, 12, and 13 (like on the Uno). The Mega's hardware SPI pins are: Display DIN(MOSI)- Arduino Mega 51, Display CLK (SCK)>Arduino Mega 52, Display CS-Arduino Mega 10, Display pin DC-Mega Pin 9, Display Pin Res-Arduino Mega pin 8.
