the SPI CS pin is D53 on a mega, thats how i have it wired. (i know it says other pins on the top notes of the program but im not using an Uno im using a MEGA). Without changing any of the wiring, I can get EITHER program to run and work just fine, just not BOTH at the same time. The only pins I share are the 4 data pins, 7,6,5,4. the rest are all ran independent. The SPI display uses pins 51-53, the other 3 displays are on pins 4-13