I don't have a 71 tach dash in stock; I wish I did. In fact, that is the last remaining year/model that hasn't come in yet. A 1972 tach dash will work just fine in its place; the 72 just has some seat belt reminder wiring added to the 71 but it can be ignored.
BTW, the first person who submits a 71 tach dash for refurbishment gets it done for free, so I can absolutely confirm the reverse engineering for future conversions of standard to tach configuration.