i just rode my bike for the first time and i noticed there's no gas meter? how do u know if you're near empty? i did notice something beep before i filled up, but i couldn't tell if it was the bike, or if i was hearing things, or if it was something i passed by. is that beep the only indication that it's time to fill up? how much roughly is a full tank?.. btw it's a 2000 zx6r.