AFTERMARKET GAUGE CLUSTERS PICS

Not an A body but maybe it’ll just get your creative juices flowing....

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AutoMeter gauges. Are they the 2 5/8 or the smaller style. I wanna do something like this. Is it a standard conduit size that I can use a Greenlee punch to make holes ?
Thanx

When you say juices flowing , do you mean.... Forget it. Old age.