From above diagram the yellow lead would run to the cluster connector.
When actuated it grounds the low fuel indicator bulb which appears to occupy what would be the TEMP location on a standard cluster. Not certain... but looks like position #2 in the cluster plug. Tracing the cluster ribbon from the plug to the LOW FUEL bulb location would confirm.
The warning bulbs are all powered one side from the ribbon connecting to the pink wire in the cluster connection.
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68 Acadian SS-350 auto/AC driver
70 Nova SS-396/375HP Bench Stick
72 Nova SS-350 5sp Mini Tubbed
67 Chevelle Conv. SS-427 clone
70 Chevelle SS-454 LS-5 M-22
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