Removed Column Shifter, but how do I keep it from rotating?

Hey everyone! My 73 Swinger has a Promatic Shifter installed (Previous owner) and the column shifter has been removed. The issue is that the column shift still rotates when I drive and makes me need to move it around to get the key out. I also am planning on adding a Tach and that would be a perfect spot, I just don't want my Tach to slowly rotate as I drive either... any answers?
Joshua,
You might look at the How to section on here. There's a good Write up on converting a auto to manual column. Just an fyi