Quote Originally Posted by Chevy-Art View Post
Some of the cluster wires and harness for the old ecm go through there.
From what it looks like the VSS wire and the fuel pump relay are the only two wires needed through that bulkhead, there is also a larger (10 ga) power wire that goes through there as well for the dash power I think. Anyone know of any other wires that go through there?

Better yet, anyone have a diagram that shows the wiring of the dash, and it's colors?