I cant help thinking that it is better to run the water injection from the SECS monitor (only if you have one - obviousely ), for a start it is easy to adjust/set up, and you get a "run" indication for the pump.

Also, it is easy to test if the installation is actualy working by connecting temporary a spare jet poking through the bonnet vent, then lower the pump run point - say 18 PSI boost with 12 ° charge temp, then take the car on a run and observe for a nice spray of water