You shouldn't. I'm not familiar with exactly how Painless does there harnesses but most the aftermarket harnesses will require about four or five wires to be hooked up. Did they include a fuel pump relay in the harness? If they didn't maybe a couple more.
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'68 Short Step
LS1/T56, Hydratech, Fatman Fabrications Stage III, Baer, Hot Rods to Hell, US Body, S&W, etc
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