Your shutoff valve is your gauge, leave it in the on or main position until your engine starts to die, then switch it to reserve. Or you could put a tee fitting in your fuel line and using clear fuel line, run it up the side of the tank and into the fuel filler neck, or an aquarium air stone could be hooked on the end in lieu of putting it into the fuel filler neck. Duct tape the whole mess to the side of your tank and, viola, you've got a rolling fire hazard, er sorry, gas guage.
Re: gas gauge?
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