installation help needed for a 8920 tach adaptor (MSD)

[wolfswest]

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

[wolfswest]

nobody? 

[Peter]

I wish I could help you,
but i dont know shit about MSD 
maybe Jelle knows?

[TexasTom]

Have you tried: orange to coil neg. (-)?

[wolfswest]

Have you tried: orange to coil neg. (-)?

nope, I have not tried that combo...  because msd writes down in their manual to avoid the coil for any output... 

[TexasTom]

Check this link ... this guy may have been dealing with your same problem(s) ...
http://forums.pelicanparts.com/porsche-911-technical-forum/206704-msd-tach-adapter-not-helping-2.html

[Eric Ellis (57HotrodVW)]

Have you seen the following PDF file? It's related to wiring an MSD 6 box/8920 tach adapter, and includes a reference to an orange wire from the the ignition box:

http://www.msdpowersports.com/pdf/frm22049_pn8920.pdf

You may also find the troubleshooting tips in the thread at http://www.msdignition.com/forum/showthread.php?t=3348 helpful.

[wolfswest]

Eric, Tom,

thx for the input guys.  I've read the posted links but they are all for the newer 8920 box...  I've logged in to the msd forum and I started a new topic.  I'll hope there is an old school msd dude out there to help me out. 

Dem