I think it depends on what harness/engine controller you use. I believe that the Holley harness provides a tach signal which would make it easy. A factory harness (as in one removed from a donor car) probably doesn't however I am sure there is a way to make it work via one of the MSD tach boxes or something.
It is hit and miss. A lot of the time they will need a driver for the tach to work. I had mine sent out and they said with the VDO internals it should work. Wrong. I still had to run an adapter. This is with a MSD ready to run distributor. You might be better off getting the tachometer updated and then run it on the bench before installing it.