Or, keep the electric pumps working and go by mileage for fuel level, which I have done for every pre 1992 Ford I have owned.
And install one of these,
https://www.amazon.com/Smittybilt-2798-Jerry-Gas-Holder/dp/B008CLNYPC
And maybe add the 38 gallon tank and one of these in bed spare tire carriers,
http://www.lmctruck.com/icatalog/fd/full.aspx?Page=27
Or, park it, and look out the window and say, dang that's a nice looking truck!