does anybody know which one of these wires operate the fuel level warning light?
i have removed the centre dash display to fit some gauges and ive lost the peice i took off so i cant check it. i want to use the old fuel level warning light wiring with an led.

the red/black wire is 12v-ign
the brown/white and brown/green are earth
i guess 1 earth is fuel level the other earth is coolant level(which mine has'nt got)
anybody know which is which.