A body aftermarket gauge cluster...

I don't know if you've seen this, but it's really similar to what you have to do with the new vintage gauge cluster. Gauge depth can get tricky around the dash brace bracket that the pedals and steering wheel mount to, as well. You can get by for a lot less like this though. Well, Stephen Mulkey beat me to it, but I wish I had seen it before going the route I did.