1969 Dart Rally Gauges?

Well, it wouldn't be correct for a US market car at least.

If it were just the gauges, I would say it wouldn't make much difference. The problem is the execution. To switch the dash frame you also need to remove the VIN tag from the original frame and add it back onto the rallye dash frame. So, if you know that the rallye dash isn't stock for that car, then you know the VIN tag was removed at some point. That's not something that will sit well with everyone, even if no "funny business" is involved. Because even if everything was done above board, there's always the possibility it wasn't, and it will be hard to show it was done correctly later.

The only other way to do it is to modify the stock dash frame. That can be done too, I did it on my '74 Duster. But, it's definitely not a "bolt in" operation and it's not super easy. The result is a dash frame that is heavily modified and obviously not original. I was ok with doing mine because it's a '74 /6 Duster so my resale already sucks and I'm not worried about it. That and I don't think I anticipated everything I'd have to do to make it work. It can definitely be done, and probably done cleaner than what I did, but it is a process. The result with the gauge panel mounted in the car is good, but when you pull the gauge panel out you see all the modifications.

So, I guess the short story is that it could affect resale more than you might think because of what's involved with swapping the dash frame.