I took this from their website:
The 10 position tuning button ensures you have proper flow in situations where you need to lower or raise the flow. This feature changes the max dutycycle of the pump. This is great for fine tuning. As you turn the knob higher you get more dutycycle. In otherwords, it will lower the maximum flow of the injector when you lower the knob. If you have tuning needs you can hook up our free software to change the start pressure, max pressure or curve of the system.
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