Is tach wiring in standard rally gauge harness?

I have started the restoration of my dash. My 71 Demon 340 came with the rally gauges but no tach. I have acquired a Tach cluster to convert my rally gauge dash. My question, is the tach wiring already in the rally gauge harness or am I gonna need a separate harness for the tach? Need some help figuring out how to hook the tach up. Thanks