Ok, so i tested the ohm range from the sender before i bought the gauge. the sender read 2 ohms empty and about 112 full. so the closest gauge was 0 empty and 90 full. i bought it attached all the wires how it said, and when the sender is positioned at empty the gauge would read full, and vice versa. so it's working in reverse!!!!!!

Does anyone know how I can fix that, or what could be causing it to do that?

PS: Something tells me this gauge thing is never gonna get fixed!