Do you mean the light that has the little arrow? or the gas pump looking light. If it's the one with the arrow, that's actually painted onto the dash.
lol when i first got my car i was like wtf is that...i thought my sensor for the gas tank was fucked up already because the dealer gave me a full tank..i just sat there thinkin and i was like oooo..it tells you where the gas tank is..on the driver side..japanese iginuity man..
