there is only one wire that comes from the distributor....but on the back of the instrument cluster, there is 3 plugs on the back of the clusters with a tach. If you do not have a tach now, then you would not have all of the plugs/harness.
I have a gray tweeded dash with the instrument cluster that has a tach and there is already white face gauges installed for sale if you are interested.
go to my page and check out my truck and let me know.