Hey Rolf...
No... If I could remember I might be able to capture that.
I also installed some after-market pedal covers in brushed aluminum with "vents" that are back lit in blue, and some BLING WSW nozzles and rear license plate bolts that all lit up in blue. My wife was pulled over for them as CA law says blue lights are just for cops. I must admit it was a bit over the top... and she got out of an equipment violation by PROMISING them she'd (kick my ass) and make me remove them.
I also would not recommend blue for guage lights as it make things hard to see and the "moodiness" wears off real fast.
For the X... there are direct replacement BLUE or RED or GREEN bulbs you can buy but its best to remove the GREEN covers you'll find inside the instrument pod and then its still hard to see, even with WHITE guage faces and a BROWN WIRE MOD insuring you have good voltage to the bulbs. On the X, I pulled them out and went with higher wattage GE W5W bulbs and am now enjoying my night driving.