tach hook up?
Little more research done.
All of the aftermarket stand alone EFI kits have a tach output pin that should send a suitable signal to your tach.
But if you are using the factory ignition system it can be a bit trickier.
Fortunately MSD sells a tach adapter that will allegedly work with any msd tach.
http://www.autometer.com/cat_accessoriesdetail.aspx?vid=99
Best of Luck.
Regards,
Joe Dokes