always worked , no probs until I installed the Smart Tabs. Yesterday it didn't work when I went out for the tab test. The little hole in the front of the foot is open... I'm assuming that this little notch is where the water is picked up for the speedometer.. ?? Is it possible that the tabs are diverting the water away from this little notch and not letting the speedometer work? How does this thing work anyway? Does it physically connect to the speedometer on the panel so water pressure operates it or is there some other method of getting the info to the speedometer head?