It's there, and it has never moved, same after I done oil change, is there a way to reset? I think it is not showing the right oil level.

 

What do you mean by the oil level indicator? The oil dip stick? can you post a Picture?

 

Sry， could not upload pic idk why, it is the gauge above transmission gauge, to the right of the rpm meter screen.

 

As you can see in my avatar, the meter remains unchanged, it's like it no longer detects oil level.

 

It's hard to tell much of anything from your avatar picture.
I'm going to guess your driving a Series 1

The S1 does not have an oil level gauge as such that it will change as the oil is consumed.
It either detects oil or it doesn't.

Edit
Oh I believe there is a pressure switch that works the same way. On or Off gate.

 

He is referring to the dummy oil pressure gauge.

Waylon, that isn't an oil level gauge, it's an "oil pressure gauge". I put that in quotes, because that is what it's called, but it doesn't even show oil pressure. The switch only has 3 positions. Full left means the engine is off. Somewhere in the middle means the engine is on. Full right only occurs in some specific tests or reset conditions that you have to manually trigger.

You can ignore it.

 

Oh, .. Dipstick all the way. Thanks!