I installed mine this summer. I made a aluminum plate (junk yard) that's installed on top of the quadrant and found that the regular size ram is a tight fit. Used two of the existing tapped holes and drill three more (two bolts and one for the pin). Would order the shorter ram if doing it again. Installed the ram's bracket from the underside of the shelf with 1/2" spacer, after reinforcing shelf with lots of fiberglass. Rudder angle sending unit was mounted on the glassed in piece of alum angle (junk yard) and pin on the new quadrant plate. Had the install checked out by an authorized RayMarine guy, he said it was good to go. Seems to be doing well, only have about 1,200 miles on it. Just keep the angle of the ram 90deg, from your takeoff point which is 10in from the center of the rudder post. Rudder angle come off perpendicular to the centerline. There are software setup points which must be entered during your seatrial. I mounted the computer under the nav station desk, up as high as I could get it. The flux gate compass was mounted midship just under the floorboards behind the shower sump. When working thru the lazarette, take a dollar store noodle and split it to give you some padding while hanging over the edge.
see attached photo
https://drive.google.com/file/d/0B7NLlT ... cslist_api