I put an electronic IVR in it and had the entire cluster out as well. Cleaned everything up and added a good ground. Frustrated that gauge would work sometimes. After reading your issues I thought why not go push all the connectors in? While the engine was warm and running I pushed and wiggled all the bulkhead connectors on both sides of the firewall, no change. Reached up behind the cluster and wiggled the cleaned connectors and the needle swept up to the middle! Woohoo!