If all your gauges are either completely dysfunctional or if they collectively fail at the same time, then you have an under-dash ground problem. Your cluster is likely ok as is.
But if you have some gauges working and other failing sporadically, then you have sender issues. The tank guages are notorious for failing, and the oil pressure and temp gauges are already useless. So, in that case, you need to address the senders, not the instrument panel. Your cluster is likely ok as is.
If I were you, I would fix any offending senders and clean all the grounds. Then instead of fixing the stock cluster, I would (and have already) devoted my time to investing in good Autometer gauges and pods to replace the stock idiot gauges. Since I have 7 guages now in my IDI van, I almost never use the stock gauges anymore except for
just the tank quantity. Even my GPS has a better speedo.