Got the headlights working - just as you guys said, I had to repin the low/high beam. - Thanks
As for grounding the 4 wires at the back of head - for temp gauge etc. - a no go.
I grounded each of the four wires one at a time, ( with key on) and nothing happened either gauge\light-wise-at the instrument panel.
So I guess I have to start my way backwards - wiring, all the way back to the instrument panel.