That is my plan. I cant see dropping the $$$ on a new tank when I have 3-4 eb tanks and a tank from the donor mustang.
Make sure you address the fuel vapors!! Fill the tank with water or CO before cutting/drilling/welding so you don't blow your ass up, and become "that guy"
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I plan on using a low pressure inline pump to run the front aux tank to the rear tank on a toggle switch. I got this idea from the gm trucks with dual tanks, they constantly pump the rear tank into the front tank.