I currently working on a few members speedos to convert to multiple LEDs, you've seen the pics, one thing that I found odd was that in order to place the LEDs correctly I photocopied my old black 140 facia and marked the symbols with a pin, however the speedo I happened to be converting was a white faced one and just out of curiousity I held them together and they were different, markedly different in the markings. The white facia starts much higher up than the black, 0 on the rev counter is where 300 revs would be on the black, 7000 on the white is about 6300 on the black. Speed markings are similarly affected, 0 on the white is 5mph on the black, 140 on the white is 135 on the black.
Now this isn't a problem if your using the correct facia with the corrrect PCB but it then struck me, which did the makers of the laser cut facias use or any aftermarket facia manufacturer for that matter, if they used the white facia as their template could you be doing 35 thinking your doing 30, do you think your tickover is too high or too low due to the spacing being out.
Food for thought isn't it?