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I read the title, and my first thought was... 'why?'.. before I looked, I figured it had to have something to do with kids....
Personally, I'd consider disabling the car rather than the gauge... or just take the keys. That's me though.
I don't know about later cars, but early stuff, just pull the wire off the sending unit on top of the tank, and ground it. Permanently... I think that would give you a full reading, all the time.. you could tell the kids, or let them find out that it's not full on their own.. heck, probably get a free tow home when it runs out (if you have AAA).
Or maybe that grounding trick will make the tank read empty.. I forget.
You know.. maybe you could install a hidden toggle switch.. turn it on to deactivate the gauge (either full or empty..), and turn it off for an accurate reading when you need the car... you could really mess with them kids...
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-Matt I ♥ my ♂
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