Well John, I wasn't too technical with mine. I just parked in the driveway and set them horizontal on the garage door and then headed out about 5 minutes from home on a dark roadway. I came back and dialed them up a little higher and after testing high and low beam I felt comfortable where they were at. Been quite a few hours of night time driving since and haven't been flashed for them being too high so I figure I am close.

25 ft is the correct distance from a wall or the like. The vehicle should be on a lever surface, position masking tape vertically on the wall in reference to the vehicle centerline and the centerlines of both headlights. position a horizontal tape line in reference to the centerline of all the headlights. to do this park the vehicle a few inches away will make it easier. the book says that the gas tank should be half full and no heavy loads. Low beam should be about two inches below the horizontal line and to inches to the right of the vertical line. High beams intensity zone should be vertically centered with the exact center  just below the horizontal line.

Hope that this will help.

Luppy