Bumping this for use later. Need to do these tests on my boat. I know I've looked behind my dashes and I had a green wire hanging loose. Does anyone have a diagram for the back of the actual speedometer that indicates which wires go where? I don't know if I have the green wire hooked to the correct post on the back of my speedo. Neither my speedo or my PP show mph speed. RPM's are all I've ever gone off of, but it'd be nice to have a speedo working also. Hoping my paddlewheel hasn't gone bad.