@Falcounet @Herve_Smith
Hi, Thanks for taking the time to reply, actually I ended up answering my question earlier a couple of hours ago and have been finishing the printer configuration. the cable in question if anyone else looks fo the info in the future is the filament sensor.
Concerning the RPI, I'll be running the printer with Klipper not with original firmware hence why the RPI is requiered in my case.
I now got everything working as expected including the filament sensor so all well and good; again appreciate your time replying, especially that it was a dumb prep error on my side when I starting labelling and unpluging the cables from the SKR.