You can get a fuel gauge that will work with the old sender, and very likely a speedo that will work with the old cable. You'll need a new sender for the temp gauge, but that's readily available. Tach and volt meters are standard hook-ups and don't use senders at all, so no prob with those.

I favor Autometer brand gauges. They come in all sorts of sizes and styles, seem to be quite accurate, and they stand by their warrantee in case you do happen to get a bad one.