How to do it???
Sorry, but step by step is difficult , because i wanted first to do the rpm-km/u-temp-fuel combo (don't know the right word) and nothing else.But after doing that, i felt the need to do also all the rest. (I mean all: the radiocontrols on the steeringwheel , the switchs for the headlight (up-down) , the switchs (7) for the windows. After that , like you can see in the pictures : the radio and the radio/ac/computer display (this was the most complicated to mod).
All i can suggest is : very small solder iron, lots of time, lots of smal led's.
For the rpm/km/u... combo i guess +- 20 led's SMD 1206 (3.2mm-1.6mm-1.1mm)
For the radio +-30 SMD1206 led's and 10 SMD PLCC3021 led's(3mm-2mm-1.4mm)these 3021led's are for the illumination effect when you turn the radio up-down.(i also changed the serie-resistors because the radio was not illuminated enough for me in comparing to the orther lights)
For the AC-combo +-10 SMD1206 led's and 2 ordinary 5mm led's (with resistors)
For the radio/ac/computer display 6 ordinary 5mm led's (very difficult to change them, you have to break some plastic parts and bend over the wires that go to the glass screen WITHOUT damage to the glass screen!)
Also some of the original plastics are covered with a orange film (like the 2control knobs for the ac / 2contol knobs for the radio and a plastic decoration on the radio(illumination effect if you press any button or up-down) , so all this orange film need to be removed, i did this by sanding it with a very fine sandingpaper.
If you still feel the need to do this mod: patience is the key and i bit of good luck.
Greetings Marc