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Hooking up a remote Tach.

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Ive been trying to hook up a remote tach to check my idle with the guage cluster to see if I set the pot correctly. I know that the red lead goes to the ignition coil negative and the black lead goes to ground. BUT, which wire is the negative to the coil? There are 3 spaces for connectors on the bottom of the coil and 2 of those spaces have connectors plugged in (The space closest to the rear of the truck is open). Which wire should I hook up to?

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If this is for your '90, you have a pair of yellow diagnostic connector ports under the hood, near the relay bank on the passenger side. One of those is a feed for the tachometer. I posted a pin-out for both connectors awhile back.

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