now from what I understand, the wires coming out of a grommet above the fuse block is your options....cruise control, tach, and pulse wipers.... should also be a vacuum line for your cruise.
and now from what I am thinking back to your original question, if you have everything hooked up like the diagram I posted, and all your grounds are in place, which should have one at the back of the passenger side head to the firewall, (there are more but this is an easily serviceable location) you should have a good ground for your chassis, if all is good there you can move to the underside of the dash electrical....
on a sidenote, I hope you have your alternator hooked up as that is one of the main power blocks on these cars...
if you still need help breaking down connections and wires post it up and I will help ya...