vertical speed + and -.

[tuomas]

Maybe do a separate + / - indicator with the LED module. You might be able to get a special alphanumeric segment led and hook up just the "plus" sign with some wires and wire that as a led in fsbus - then if the value is positive have it light up, and if it is negative, have just half of the segments light up, so that it shows just a "minus".

If it is the same size as your 7-segments, you might be able to put it right next to them.

Dunno, that might work.

Tuomas