The main problem here is that they both need to communicate via the Arduino's SPI bus, and I know that each of the two devices will need its own CS pin (The data logger is hard wired to 10, so the digital potentiometer will need a different one)
This would be fine, except that the digital potentiometer has one pin for both SPI and SDO. I read that to connect this to the Arduino, the shared pin on the digipot needs to be connected to the MISI pin on the Arduino (pin 12) and then to bridge the MISO pin to the MOSI pin with a resistor.
Would anyone be able to tell if this will work. I do not want to try connecting the two devices like this just in case it breaks something in the board.