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[Bruce Plecan]

The crank/cam sensors feed to the DIS module.
Then the "normal" group of 4 wires lead to the ecm for timing control.
The DIS module syncs the coils, and supplies the signal for SEFI ecms.

That explain it?.   

I don't understand your one wire comment?
Grumpy
 
| -> Nope.  Use the gm ignition module with a dissy, or the DIS and it's
| -> module with 3 coils.
|  ???
|  One wire to the DIS module?  How does it know what coil to fire?