Another option is what I've seen in a few race Panteras: TWO separate rectangular cells, one on each side of the engine. The height was about 12" tall. Each held about 10 gallons and the wt & balance of the car was improved. The cells were connected by a 2" fuel-proof hose that ran in front of the engine so the car could be fueled from either side. You don't say but such a rig on a street car could be fitted with two senders and one gauge with a selector switch.
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