For now you can use regular hookup wire, or an old USB cable that is long enough with its ends cut off would be a good choice, I’d recommend cutting a 75 millimeter female jumper in half and soldering each to the cable for connection to the spark, This is a good place to add the termination resistors if you want. At the breadboard end you can do the same with a male jumper, or terminate it the way you want to connect to the PCS (I assume a 4 x female connector) and use male jumpers to connect from the connector to the breadboard.
I’m interested in learning how it goes!