Here is one speedo adapter I had bookmarked:
http://www.abbott-tach.com/cablex.htm
I am using the Docs Blocks manifolds on my 85 and they clear the frame easily. Member 68 short step has also used them on several 67-72 swaps as well.
If you want to stick with the stock gauges you can use the speedo adapter, use the stock oil psi sending unit, and for the temp either use an adapter in the pass head or drill and tap it for the stock sender.