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My 71 K10 burb has a huge welded tank that goes from the bumper to the stock tank.. it fills via the stock filler neck that was "Y" ed.. so you never know which one fills first.. it has a stock looking switch on the left side of the dash to switch the guage from tank to tank with a manual lever next to the seat.. Always thought it was an aftermarket... Hmmmmmmmmm.... anybody else have any ideas?? or RPO numbers?
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