MY XS-Engineering power pack has 3 wires.
Black - Red w/ fuse - Orange.

In my main ECU harness I found the big fat black/white at pin 1B ignition.
Can I connect my XS-engineering power pack there?

I assumed, the XS black wire is to the ground (chassis)
Cut the black/white from the ecu harness & connect the XS-red w/ fuse
(going to the ecu)
Connect the XS-orange wire to the other end of the black/white.
Is this right?

Thank you