[Eexhaton]

If you have the UI 1.1 you already have the mod for TAS on the speedbar.
Just add the following lines to your conf.ini file:

[Mods]
SpeedbarTAS=1
SpeedbarUnits=2
SpeedbarSpdKMH=1
SpeedbarSpdMPH=1
SpeedbarSpdKnots=1
SpeedbarAltMeters=1
SpeedbarAltFeet=1
HUDGauges=3

1st: sorry for a little late reply

2nd: I do have UI 1.1 and I tried the above, and experimented with all settings for a while,but all it did, was changing my KM/H display to KIAS.
So yes, it is almost what I was looking for, now only if it would ADD the KIAS to the display instead of replacing it.

It should look like:
SPD 350km/h
SPD *** KIAS
ALT 1690 m (i want to keep it in Meters)
HDG 284 (also unchanged)

Is that possible with the above addition to my conf.ini?