Autometer fuel gauge, stock sender?

[muddpile]

What ohm reading does my fuel gauge need to work with the stock fuel sender? I bought an autometer streetrod gauge package and it came with a universal fuel gauge and its own sender. I can't make the new sender work with the stock tank, so I assume I can't use the autometer gauge and will need to buy a different one. What ohm range is a GM sender? I used to know, but can't remember.