Back in the 80s I had a 2x Leupold scope using B-Square mount/rings on mine. Finding the mounts may be a challenge, since Dan Wesson revolvers aren't as popular as they used to be. The B-Square Site isn't much help either. If light gathering is an issue, pistol scopes probably will probably leave you unhappy. I suspect a red dot of some sort might be a bit more helpful. It'll be a bit faster to get on target as well.
Something like this might be the ticket, especially if you find a red dot an appealing option:
Dan Wesson scope mount weaver style
For a quality red dot for a reasonable cost, check the C-More Polymer Railway. I have one on a S&W. The Burris Fastfire is a nice one too, for similar money. I found it a bit too small for my tastes on a handgun. Works great on my Beretta carbine though.