In the middle of the ?stroke? of tilting the outdrive up the gauge shows the outdrive ?full up? for a while, then correct again. I assume in the sweep of the rheostat inside the sender there is some corrosion or something. I have read many posts after searching about replacing the sender being a fairly large job. I am wondering if I can remove the sender and if there is a way to open it and spray it with contact cleaner, etc?