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Mine(90) has 4 wires though!

Yellow/black. Power to fuel pump
Black/ silver dot -- FP ground.

Yellow/ white- sending unit
BLACK/WHITE - Sending unit gnd.

* It makes sense that both FP and SU have separate grounds, given that both run at different voltages and current ratios[90_91).

As for the 88 there is a chance they share grounds.

**** Use a multi meter to validate each wires function.

Hope this helps.
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