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i would just get the scan gauge.
if you are keeping track of mpg with your odometer you should have a pretty good idea how many miles you have left before you run dry.
even with no gas guage you still have a low fuel light right?
as you become more effecient, you will get a better feel for your car. unless you develope serius engine problems eg. bad O2 sensor. your mpg should be pretty consistant with a trend twards more miles per tank,
if you want to play it safe, just refil at 1/4 tank or more every time.
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