[DeTomaso] Tach reanimation question

[boyd casey]

I am trying to bring my tach back from the dead. Thanks to everyone for
their input on the correct hookup of the Tach adapter to my MSD set up. I
have one more question. How do I identify the tach wire from the harness in
the engiine compartment? My car is a 73 L . Can someone tell me what color
the wire is and where I should find it entering the engine compartment?
Thanks,

Boyd