if you draw off both tanks then your going to have some issues man. first, as stated your only going to be able to read off one tank. second, since you will be sucking more out of one tank then the other (it will never suck evenly) then when one tank runs out you will be sucking in air and that will get into your system. so its not worth the hassle. one think you could do ( i would if i were trying to get rid of the fsv) is remove the back tank, weld a bung to the front bottom side of the tank and weld a bung to the top passenger side of the front tank next to the pick-up setup. run a nipple and hose from the rear to the front with a ballvalve between the lines. you run just off the front tank, and when its empty just flip on the ball valve. it will fill your front tank and since its a smaller tank in the rear theres chance of overfilling. theres enough drop in there where it will drain the tank in about 10 min. you will just have to remove both caps so it doesnt get pressure in one and vacuum in the other. unless you run a second hose to it at the top of each tank for air transfer.
1990 F-350 LARIAT 4x4 7.3L IDI diesel ZF5. 1992 front with cowl induction hood, 1997 doors and tailgate. 2004 6.0l intercooler, PSD heated power and signal mirrors. AMSOIL bypass system, full synthetic system. 5.38's, 46" tires, 20" wheels, 12" lift with shackle reversal front, shackle flip rear. Ladder bars in the rear, 2" hydraulic assist steering, hydroboost brakes, onboard dual compressor air system. twin air horns, black interior, 100 gallon in-bed tank. 94 IDI-T motor, SMF conversion.
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