My gauges look fine from the rear, no damage or wear, but they don't work. The speedometer works fine, but that's mechanical. I put a new gas tank, fuel sender unit, and wire from the sender unit to the harness in, and the gauge still doesn't register. My shop said to look at a ground wire on the back of the gauge cluster that isn't connected properly. I looked for one, but didn't have any success. I was hoping someone here might know what I need to do to get this working properly. Here are a few pictures of the rear of the gauge cluster:
