Removing the steering wheel dials from an Astra H requires a T20 Torx and a number 1 screwdriver. You must first turn the steering wheel, remove caps, and disconnect the battery. Then remove screws at the top and bottom of the steering wheel assembly to lift it off. Underneath are two more screws holding each dial in place. Pulling cables and clips allows the dials to be removed. Reassembly is the reverse of removal.

1. • Removing Astra H Dials
Don't know if anyone has done on yet but here is a nice pic tutorial on how to remove the dials
from the mk5 astra.
Ok well, what you need is T20 Torx and a no. 1 screwdriver and patience lol.
First of all we need to turn the steering wheel (turn engine on) to get the screws behind them.
Remove the wee caps and use your no. 1 screwdriver
Mind the other one
Now disconnect your battery! before proceding.
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2. TIP: Use the steering wheel adjustment so you can get some movement around it
Now the top of the steering assembly will now just lift off
Now looking from above there are 2 screws (T20 Torx) that need to be removed.
and

3. Now undo the screw (T20 Torx) at the very bottom of the steering wheel assembly (may need an
extension)

4. Now just pull out the ignition cap
Now the bottom half should just pull away

5. http://www.opelaus.com/forums/showthread.php?18446-Removing-Astra-H-Dials
Now the bottom is away we can see 2 screws (T20 Torx) under the dials that need to be taken out.

7. Now pulling the bottom of the dials under and over it will come out to reveal the under side of
the dials

8. so no you can see the cables attached (left hand side), there is a red clip on this. All you do is pull
it out and the section holding the cables will fall away.

9. when pulled
vwahla, it can just come out now.
but now to remove the dust protector all you do is push in the 2 wee clips on the back and pull it
away

10. pull away
And for reassembly just reverse everything you did.
DONT TURN ON THE IGNITION WITH PANELS REMOVED OR LOOSE! canbus will
register that an airbag has blown and you will need a tech 2 to reboot your canbus...