Yes, the earths are the spade connectors in a row. Take the spades off and remove the connecting block in order to re-make the connection.
Check also the panel light power supply from the slide dimmer as that can cause the symptom you have. If you by-pass the slide dimmer then the panel lights should come on bright. There is also a rheostat on the back of the combined instrument which are known to give problems. Those earth screws on the back may need quite a bit of cleaning to get rid of any corrosion if its present. All the panel lights come off the slide dimmer so if the other panel lights are also giving the same symptoms, then that is your likely suspect.
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