I've got a problem with my 1987 ford truck's gas gauge?

So I replaced the float in the sending unit, but when it got put back together the gauge reads over full all the time, what could it be?

You somehow wired the + connection (instead of the float's signal) to the signal wire.

You may have to get a new car.

Not grounded properly. It takes a good ground to insure resistance in the circuit to bring the gauge needle back down. Without a GRD it will read full all the time (zero resistance).

Float got stuck.

Check the ground strap that completes the circuit for the sending unit most times if that ground strap is not making contact or is missing the result is usually it will always read as full So most likely its a ground issue

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