Marc, no apologies necessary. your documentation has been a great help.
I think I had both a CDI (6pin) & a coil.
I've had a little time to thing about this. My fuse panel doesn't have a fuse for S1. It doesn't have any lead going into it or out of it:
In addition, the current flow diagrams for the '76 doesn't list an S1, just S2-S18 for the front fuse panel.
I think I might jump from the S11/S12 input (red/black wire from terminal 15 on the ignition switch) to the S1 input. The connect the black wire from the DME harness (red/green & black combo) to the out put of S1, and stick a 16amp fuse in there.
As far as the second black wire (bundled with the black/vio wire, going to tach) I'm just hooking to the bottom of S11, as you have done. Those are the same for '76 & '77.
I appreciate the additional help Marc. Let me know if you have any additional thoughts on this.
~Chris