I currently have a Netro Sprite system set up on a bore, I'm only using 9 stations currently but I can't easily add any more stations/wiring to this system. 

I can easily access the wiring where I would like to add more stations, am I able to pick up the earth and pump start wires, and add a 2nd sprite or spark controller there? 

Or has anyone got any ideas of how I can add more stations without running more wiring back to the master controller?

Thanks