First: I am glad I can help with this AWESOME mod.
Third: Make sure your tank is full to the TOP and remove the clear lens a.k.a. Mask from the cluster. This can be done without disconnecting the cluster and battery BUT, you will have to remove the dash panel and pull the cluster out a bit to get to the screws. Once the cluster is out, you can gain access to the mask screws. Carefully remove the mask to expose the needles. Turn your ignition on to make sure the gauge is at the full mark. Now, either use a fork or your two fingers and CAREFULLY pull the fuel needle straight up off of the cluster. VERY,VERY CAREFULLY place the needle back on the cluster in the FULL position.
Thats it, enjoy.