Not sure what you mean by the flasher unit, but here is how you remove the dash....
The bottom 3 sections will have to be removed first, torque bolts on the sides of the glove box and on the panel below the steering wheel next to the fuse panel, there are some other bolts inside the glove box and around the steering rack, just look out for them. Then pull the panel off it should have a few popers that you just need to give a tug, top corners of the panel next to the steering wheel just feel your way around for the others. Watch out for the bolts on the bottom of the panel, like i said have a good look around before you go pulling it off..
You then have to remove the central consol by unscrewing the ash tray, then the plastic trim around the stereo etc.. held on by a few clips simular to the panel around the steering column. Once this is off you will see some screws that also need to come off to remove the center consol, just need to drop it down to get to the dash, so dont worry about removing it, just rest it somewhere where the wires are not stretched.
Once you've done this providing all the screws and bolts are off, all you have to do is remove a metal bar behind the airbag and the top half of the dash should pull out if you pull it towards the headliner.
Edit : also just forgot that you'll need to remove the instrument cluster before you take the top half of the dash out, two screws sitting behind the plastic trim above the steering wheel, then just two clips behind the dials that pop off and they are free.