i thought my gas gauge was working fine, it was blinking low so i put gas
in and once i did that the gas meter didnt show up on the screen n i have
used half a tank since and it still has not shown up again. how do i get
it to turn back on?

 

it only comes on when you hit reserve (last gallon give or take)

 

When you see the gas gauge, its time to stop and get gas. I know its supposed to show reserve but I had mine come on once and I ended up running out of gas before any of the lights ever started blinking.

 

Mine was blinking halfway on the reserve bar meter thing and I filled it up with only 3.5g....When my F4 light came on it was like 4.1-4.3g I'd put in.

 

There is a real cool explanation of how the fuel meter works in the factory service manual you can download. It calculates off a switch in the tank aswell as engine rpm and speed, and the kickstand switch also plays a roll.