That's what I meant.
if you can set the gauge to empty, 1/4, 1/2, 3/4 and full using the TEST button is SimDash, then that is good news because it means the hardware is working fine.
It must be a software issue then.
Can you try to change the unit from Mpg to Liter in the configuration screen?
You can also run IRacing and then open the View->Data... screen in SimDash and see if the fuel values make sense...
Please report what you find.
Thank you
Cristiano
Needle doesn't move. it stays at a full tank, but i lose fuel when racing in the sim. Not sure what it could be? all the test buttons work and i was able to set 1/4 tank 1/2 tank 3/4 tank and full tank. it just doesn't go down while racing.