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Yes old system v8 new v9. You said that the 5volts on pin#6 should be there when I hit the button on the gauge to turn the system on and 0volts when off or vice versa....I forgot. Anyway I have it hooked up again and now I'm reading 2.2volts whether the gauge is on or off. I also have a problem with the HSV. I'm assuming that's the source of my little "water pulse" problem. I guessing the slight pulse is because of the pump idling but the HSV seems to be open, allowing the pulse to make it's way out the tube.
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