Guy Byars wrote:

But it is useful to have that so you can set the trim correctly before
takeoff.

Not really. We operate two ASK 21, and frankly, I don't even know
whether they have that indicator or not, although I've learnt to fly in
them! If you know the ASK, then you know the correct position of the
trim lever. If you don't know the ASK, then move the lever full forward
and full backward, and then you know where the middle position is. This
is good enough for takeoff, and once you're airborne, you'll have to
retrim anyway.

Stefan