This thing:
Attachment 52655
When you put 12 volt on one terminals and ground the other is it meant to shut, i tried both ways? Mine does nothing, still reads 70 ohm tho, like it says on the black plug. Can you take them apart and clean? How do you adjust the 7mm screw, that shiny...ish one above the hose barb, something came up in a previous post but it was a bit vague. Cheers guys.