‘71 Demon with Ralleye Dash looking to retrofit Intellitronix

It can be done but I don't know of anyone who has done it, kind of a downgrade to most but I understand your situation. If you do go that route I would get an entire dash assembly from an a body and start there, or you can send out the current instrument cluster to be restored. The other option is just to fix the instrument cluster yourself and there are quite a few replacement parts and tech on how to do it. In my opinion it would be easier to keep/repair the rally dash.