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So far always below a 1/2 tank, will do it when staring out first thing. Doesn't go off when you turn the key off and back on again but may not be on the next time I drive it.
My 91 FSM says the sender provides variable resistance to the gauge cluster, where its used by the gauge needle and a "low fuel warning module" separately
When the module senses 66.5 ohms or less from the fuel level sender for 10 continuous seconds, the indicator will light. The indicator will remain on until the module senses 63.5 ohms or more from the fuel sender for 20 continuous seconds.
If the gauge needle isn't jumping around, then I would assume the sender is okay and the module is bad. According to the diagrams I have here, the module is inside the gauge cluster and it looks like it's a semi-serviceable part if you want to mess with it. Might just need to clean the contacts