‘71 Demon with Ralleye Dash looking to retrofit Intellitronix

bob1970 said

Yes, I did that too but I am looking for anyone that has executed this change as well for some experience on what to do.

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Of course they make a kit for a non-rally dash.
I would think in your case you would have to make a template with the factory gauges so you have a backing plate that attaches to the back of your cage cluster area. Then cut holes out of that backing plate to know your singular gauges on/in..