Upgrade single-tank conversion on MB 300D to dual-tank

Hi, I am planning on upgrading my '85 Mercedes 300D from a single-tank WVO conversion to a dual-tank WVO conversion. I have pretty much no experience working on cars so I am very unfamiliar with the fuel system of the vehicle. I am hoping to use a combination of the greasecar kit's instructions and the vehicles mechanics guide to get me through the conversion. However, I'm concerned that the instructions will at some point not work out for me since the car has already been modified from its original state for the single-tank conversion and the instructions will assume that the car is in its original factory state. I'm looking for some advice as to what I should be aware of before I attempt to make any changes. Any help would be greatly appreciated. Thanks!

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