Just to add this:
I friend put a homemade Shurflo based system in his Evo 7 with zero diagnostigs/flow monitoring. A couple of months later the system failed for some reason and filled his engine with water without him knowing - the engine got damaged and needs rebuild now ...
At the same point I put an Aquamist 2D in. By accident once I shorted the brown wire to the high speed valve and the system started flowing at 100% water IDC at no boost (the car was cruising at the time). If it was not for the 2D warning LED, I would have blown my engine too. I saw the LED, I stopped and turned off the w/i temporary. When I got home I found the problem, fixed the shorted wire and everything works perfect since then ...
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