[jabb]

I have the MSD Tach adaptor 8920 for magnetic pickup.....
I am a liitle confused about the wiring.... It has 4 wires....

Red, Blk I know how to wire.....
The White and Purple I am confused about....
In the directions it says the purple is not used ???

Also where do I tie the Blk and purple tach wire into.....

This is a replacement for and 82 SC that was running a 6 pin permtune box.

Thanks