The neg side of the coil. Unless you have an aftermarket ignition, that will void the warranty. If you do, hook it up to the tach output on the box. Hope this helps.
Caymon
PS - It didn't come with instructions?
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'90 GT Under construction
Best E.T. = Fast @ High Speeds - OK So I Lie. So What!!!  
04 F-150 STX 4.2L 5 spd
Rice Haters Club Member #128
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