Hi guys,
recently I bought myself a msd setup but my old school vdo tacho wouldn't work with. Did some reading and I found out a 8920 tacho adaptor would do the trick. Now, I have a very old model I can use from somebody but this version has an extra wire.
The latest 8920 box doesn't have the orange wire anymore and I can't find a wiring diagram for the older models...

please help!! If someone have the same setup or know something about this old stuff, any help is appreciated!
I wired it like this:
black: ground
red: + from iginition switch
white: on the tach output on the 6al box
violet: to the vdo tacho
orange: don't have a clue, and like this, it doesn't work...
thx,
Dem