After market Tach into 78 ignition and MSD setting

[jaynez31]

I just bought a after market tach(autometer # 2301) and can't figure that out the violet colored wire and white colored wire. Privious owner installed tach adapter twice and failed it. Now I bought after market tach and would like to install it my 72 240 with 78z ignition and distributor with the MSD 6AL.

My current system is verry much like this:

http://www.msdignition.com/pdf/pdf26.pdf

and the autometer's instruction, page one, figure B:

http://hp.autometer.com/instruction_download/instructions/468h.pdf

1. What's shall I do the "Violet" wire.

When I looked two of the wires(Green and Violet) from MSD ignition box which connect to the 78 z distributor. By the drawing from the Autometer's webpage 1, figure B, only the green wire from MSD ignition box to the Autometer's tach. What's happed the Violet wire? Do I connect the violet wire to the distributor? or Will I not use it?

2. How to deal with the "white" wire from MSD ignition box.

From classic z car site indicates the white wire from MSD connected to the Tach adapter, then connect to the B/W or red wire from MSD ignition box.

I went down and check my car, the white wire is cut off and does not connect any wire what so ever.

http://www.classiczcars.com/forums/showthread.php?s=&threadid=13085

3. Do I connect any wire from MSD to the distributor?

Violet wire?, red wire, or none?

I think I explain my problem clear hopefully.

jaynez31

just like my 240z, I am from Japan too, what's heck.