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Are you saying that when you switch the headlights on, the seat belt light comes on, even if the seat belt is fastened? Does it work properly with the headlights off?
Your bulb plugs are mixed up behind the bezel.
You have a normal back light bulb in the housing where the seat belt bulb should be.
If it is dark in your car with the lights off you may see one gauge with a back light until you turn the seat belt light off.