HFS-6 with Standalone ECU

[BakZamGai]

Hi Richard

I have previously installed my HFS-6 on my 2008 Subaru Impreza STi, running on a reflashed stock ECU.
Now, I have upgraded to a standalone (Link G4 Xtreme), piggy backing the stock ECU and would like to utilise the failsafe mode. How would I interface the failsafe with my standlone ECU? It has many spare digital/analog inputs.
How can I use the HFS-6 controller to trigger the ECU to switch to a failsafe map?

Thanks!

Cheers
Dennis
Current still on single point water injection on stock engine, hardware for port injection in place, awaiting new engine and turbo