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Here are a few pics that might help.
After removing your driver side knee bolster, the wire bundle is just behind (and tucked up under) the steering column bracket/brace as seen in the pics.
It's been a while since I wired my tach light but seems there were a total of 4 solid white wires in the bundle.
The wire I needed for my tack was just slightly off colored than the other three. It was kind of a beige color if I remember correct.