Is it tacky to request specific gifts or just ask for cash?

The customary way to request gifts is to mention where you are registered on the invitations. Then your guests can go to your registered stores and see your list of items from there. Typically, it isn’t classy to ask for money as a wedding gift. You can mention that you are not registering on your invites, but you shouldn’t ask for cash. Most of your guests will know you and know if you need money over a new blender, especially if you are a couple who has been living together for several years. Trust that your guests know what’s best for you.