This is where it becomes a sod. I looked into chaning all my lights to blue, but seeing the thread on the US forum where guys have done it, it is a mission. From what I can see, all the lights under switches and behind dials are LEDs, soldered to the boards directly. So swapping them means un-soldering them all and soldering the new ones back in
I just realised with these glow dials, its going to look odd as you're gonna have all blue dials but the digi readouts on the guages (trip computer and odo) is still gonna be orange because of the backlight