Fuel gauge on KOSO digital speedo (AEROX)

basically i have wired up all the lights (indicators, oil, high beam warning) correctly and have also connect and programed the speedo to work fine.

Now i am having trouble with the petrol gauge the clocks have one wire (GREEN) that on the diagram says to connect to fuel negative (-)

My bike has three wires comming from the fuel sensor.
one makes the fuel gauge say full
Second makes it say empty
Third one does not even show fuel gauge when connected (earth?)

how do i get it to work the fuel gauge in my opinion is the most important thing there.

 

have you tryed putting the two wires that show full and empty on it??

just a guess m8 i want to do this sometime