Cluster is pooched. U can pull it appart and blow and dry it out but when they get like this its normally game over. These clusters do weird things. Fuel gauge is normally first to fail. I've seen lotsa weirdness.
They're known to have the solder crack where the pins attach to the circuit board also. Fairly easy to disassemble.
Buddy took his to an electronics shop and they went over it for $50. Fixed the problem.