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Q: 1988 Buick LeSabre fuel pump wiring harness: Which wires go where? on 1990 Buick LeSabre

It's actualy a 1988 model. The list didn't have that choice.
The wiring harness is made by Precision.
I've got 4 wires. 2 for the pump and 2 for the fuel gauge. I know which wires go where on the pump and on the fuel lever sender. Which slots do I put the wires in on the 4 wire plug?

It also looks like 1 of the wires in the 4 wire plug isn't going to connect to anything. What's up with that?
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