Stewart Warner Shift light install help

I bought a stewart warner shift light with digital tach. The tach adapter is pretty simple to install, but i dont want to **** around with the shift light itself because i dont have a wiring diagram of my car.;
Does anyone have a diagram or can anyone point me in the direction of how to wire a tach to the ignition switch and ignition itself? I know its probably very simple i just want to be sure im doing it right (phobia of electrical work)

thanks

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