^^ I fixed my temp guage by just pulling the cluster out and plugging it back in. It has two big plugs on the back of the cluster that go into the dash behind it. Once you figure out the little button to pull the headlight switch out, it's super easy to get in there and yank the cluster.
You might get away with just pushing the whole cluster in, before you tear everything apart. The plugs are in the upper middle part, just put your hands on the plastic of the guage cluster, and push hard in towards the firewall. Maybe you'll get lucky.