The HFS-6 can run on MAP sensor as shipped. Just change the jumper link from PWM to MPS, just need the mAP senasor signal. I like to use the fuel flowe signal so that the water flow id directly proportional to fuel.
If the flow is based on pressure only, you will be injecting water all the time because a turbo diesel reaches full boost very quickly, even a medium load.
You can play with the MPS mode on the system at your procession, let me know, may be it is perfectly OK.
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Richard L
aquamist technical support
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