What I would do is go to the junkyard and look for a GM car that has a low fuel light. Pull the gauge cluster, and pull the circuit board from the cluster. Trace the circuit and note which wire goes where first. Or just take the whole cluster if its cheap enough.
I know my 92 Trans Sport van has one. There was a webpage once about how to do this with an 85ish Riveria, and the board new was available from GM for $35.
Knowing GM, you might very well have a spot in your cluster for a low fuel light, just no board.
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Winter daily driver, parked most days right now
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