How to mount a non electrical fuel gauge on a motorcycle?

I have a classic minibike and it has nothing electrical on it except a light, I usually find myself running out of gas when I take it somewhere, I don t want to drill into the gas tank and mount one on there and I don t want to connect a battery and mount an electrical one, I just want a normal fuel gauge that is... show more I have a classic minibike and it has nothing electrical on it except a light, I usually find myself running out of gas when I take it somewhere, I don t want to drill into the gas tank and mount one on there and I don t want to connect a battery and mount an electrical one, I just want a normal fuel gauge that is mounted by the handle bars. Any ideas???
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