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How is it acting erratically? Does it indicate more fuel or less fuel while running? Does it bounce around?
A bouncing fuel guage is likely the fuel sender unit in the tank. Unfortunately, they are usually integrated into the fuel pump. You could get a wiring diagran and try to monitor the voltage to the guage with a DVOM while someone else drives to verify this is the issue. If it is the problem, it will not impact the engine function, so you could just live with it unless it really bothers you.
From what I see on the internet , there appears to be a mechanical fuel pump on the engine . So , not an electric fuel pump in the tank .
Sometimes , you have to drop the tank to get to the fuel gauge sender unit . Some times there is an access panel that can be removed . Maybe under the back seat .
If you do end up dropping the tank , drive the car until there is very little fuel in the tank . Not nearly as heavy that way .
God bless
Wyryeah it has a mechanical fuel pump, im gonna takee out the fuel sender unit and maybe clean it or replace it, i will check its resistance.
Found the problem, fuel sender unit float is full of fuel its punctured and also when testing for the full travel of it, needle went mad when hitting half tank it was bouncing
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