Dual fuel gauges?

[Thatoneguy]

If you're keeping the FSV, just tie the new level senders to the original wiring and use just one gauge (that gets switched with the FSV, like stock).

I'm thinking that's what I'm gonna do. The more I think about it the less I wanna do two fuel gauges. No point and costs more money.

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[Thewespaul]

Up until you went on any sort of grade.... With tanks that far apart it wouldn't take much of any angle to have enough level differential that you could pull air and/or overfill a tank. Beyond that, you've got the issue of going past the axle. Not a great idea.

Not an issue on heavy truck and equipment that I work on that uses saddle tanks and other dual tank setups.