Hey guys

I've notist when ever I fill up the gauge only goes to 3/4, also my fuel light isn't working I'm assuming they're two separate issues.
Does anyone have any ideas as to what I should look at first?

The fuel level sensor most likely.

Ok I'll test it when I get home, thanks

Another possibility is that the gauge needle(s) have been removed and put back on in the wrong spot in your instrument cluster. Do you have different gauge faces/overlays or anything?
 
I know this because it happened to me once a very long time ago :)

Hi there, this may help you out. I just replaced the dial backrounds on my instrument cluster with white ones, if you don't take notice/pictures of where the needles are before taking them off this may cause this problem including your fuel light not coming on. I filled my fuel tank completely before changing these out, you also need to have your cluster plugged in for 5 minutes for the needle to sit in correct position, your needle may have been put back on in the incorrect position.

or borrow another instrument cluster from someone and see if you still have the issue