Water/Meth injection with Chrome ECU

Hi all,

Tried to search this earlier but Tapatalk is playing up for me.
I'd like to use spare output pins on my Chrome ecu for triggering a water/methanol injection kit I recently acquired.

I've been looking at the from and can see that custom pin 35 or 48 can be switched on and settings for the trigger based on RPM or Load.

Aside from this can anyone shed light on adjustments to fuel maps and how its best to approach adjusting more timing.

Im going with water/meth injection instead of other popular fuel type options like E85 Due to affordability and detonation supression qualities.

Car is being tuned on 98RON fuel and runs stock 9b turbos. Using a 3 bar map sensor for boost measurement and im about to install a 3 port BCS (currently runs a MBC).

Any info is appreciated

Thanks