It looks like a
DIY thread actually.
Furthermore, you can save some space and time by
searching (see the menu at the top of the forum page) before posting. The DIY forum has a
similar thread on it's first page.
Also, notice that F20/F21 have a lot
in common with the 2 Series and are very much the same(?) as the 3 Series coding-wise (the design of the cluster is different). Those two other Series forums are much more populated than this one.