I am replying to this thread because I had a very similar issue and found the problem. I wonder if the OP had the same issue as mine? Here is what happened to me: When I was dealing with theses symptoms I installed a volt meter on the dash so I could watch the voltage, then I noticed that when I bumped the steering wheel, the voltage would go eratic. I ended up pulling the instrument cluster, and sure enough, one of the connectors to the cluster was rubbing and 2 of the wires had rubbed almost completely in two. If someone is dealing with this, you may want to check the connectors behind your cluster!