How to delete secondary fuel sending unit

Does anybody know for sure how to delete the second fuel tank sending unit? There is no master on/off switch listed. Just the following parameters:

Capacity
Primary Capacity
Sender Max V
Sender Min V
Sender 2 Max V
Sender 2 Min V
Primary Volume
Secondary Volume

I downloaded a couple tunes, and the only difference in any of them seems to be that some have the secondary volume table zero'd out. That table seems to be secondary fuel tank capacity vs voltage (a transfer function for the secondary sending unit).

Pretty sure I can just zero out the secondary volume table, but would like to hear from somebody who has done it, before i waste the credits. We're trying to take a truck that came with two tanks, and just use one tank.