1990 Mastercraft Prostar 190 is the boat. We are ordering a tower for it and they suggest to measure two distances between 42 and 48 inches apart. I was thinking to measure just on each side of the windshield. Should I measure to the edge of gunwale? and then actually mount it below the gunwale to where there is access in the hull?<br /><br />Suggestions on measuring and mounting the tower?<br /><br />Tommy