It depends, which sending unit wire are you using for your 38 gallon tank, front or rear? I'm guessing rear?
If the front tank is also removed, you could just put 3, 4 and 5 together and it wouldn't matter since the front tank sending unit wouldn't be there to send anything down the #3 wire.
I bought a tank selector valve to replace my factory valve that went bad. The new one was not exactly like the factory one so I had to splice in a new wire harness for it and modify the plumbing for the fuel lines. I made a video that hopefully helps to simplify the process for others that find...
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