TANKWRX

Hi all iv got a swoosh all in one system and on wiring it up I can't seem to find a wire it's asking for , all the systems work but the only one not working is the shift light and rpm readout the single wire I have on the diagram need to be connected to the ( speed sensor ) I connected in to the speed sensor wire running to the Ecu and this dose not work for the system is there another wire I can try to add it to ( 1993 import wrx )
Cheers