I installed my ultraguage and set up fuel tank size and engine size, but i go to calibrate my fuel level as I'm at a half of a tank and it will not show anything but a full tank. What can i do to get the ultraguage to match my level in the tank?

 

Well I'm blown away with the 579 mpg I'm getting on the gauge but I know that it is wrong so I'm thinking something is wrong. I'm not able to figure it out.

 

Slightly off subject but still UltraGauge related.
While setting my up gauge I also took the case apart and added a piece of colored plastic film to continue the interior green light theme.

On the top, bottom, and sides are small holes that need to be pushed in to release the locking tabs. Take your time and be careful, enjoy the result.