Hi @dave0708 ,
I found a similar display from Joy-It and this documentation:
https://cdn-reichelt.de/documents/datenblatt/A300/SBC-LCD128X64_MANUAL_2021-07-29.pdf
it's a little bit strange ...
Although it is titled "SPI" it does not use the UNO default SPI pins (10,11,12,13) but those which you have pointed out as the original data in the ug8 example (16 = A2, 17 = A3, 18 = A4, looks as if MISO = Master In Slave Out is not connected, not here and not in the Raspberry Pi application).
You might give it a try ...
Good luck!
ec2021