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Q: Where do you connect a tachometer to check the Revolutions Per Minute at an idle on 1993 GMC Sonoma

I have replaced the throttle body and need to verify engine speed
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Engune idle speed is not adjustablle! That screw is only a throttle stop, ecm has control over idle through IAC valve!!
There are 5 wires running to two separate plugs, which one is negative, and do I pierce the wire?
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The white wire with the pnk/blk, the other white wire is a digital signal for the instrument cluster, if the tach is digital use that one.
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