One side of the switch will put power to the solenoid. The other side will put signal to the fuel gauge. I don't think you'd want a center off-type switch though. A dpdt switch should do it.
Center tab of gauge side gets the wire to the gauge, the one outside tab gets the wire from one tank, and the other gets the wire from the other tank. Now the tank solenoid just gets power thru the switch so that the tank that the gauge is reading will be the one supplying the fuel.
1978 CJ5 5.0HO/T177/D300, '86 D30/D44 WT axles, 'glass body, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy
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