Recently did this to my S1 only I used 666DAN's Red LED's and they're very faint as well as very patchy, I think this comes back to the instruments having a blue contact layer applied to them which can't be removed. I can say however that the cigarette lighter socket works well with a red LED.
In conclusion these LED's are really only good for small things in Stageas like gauges, climate controls and cigarette lighter sockets.