Use in tank electric fuel pump to empty tank?

I am going to drain the fuel tank tomorrow. The reason is I am adding in Meter Match unit. Back in 2016 when I put FI on the car I put a Tanks INC fuel level sensor in. It stays on full for a while then moves to near empty when there is still around 1/2 tank of gas. As the car was drag race only I did not really care. Now I have turned the 68 Barracuda back into a street car having an accurate fuel gauge would be nice to have. The Meter Match has a couple of options to calibrate the unit, but calibrating to an empty, then 1/2 full then full gas tank seems to be the most straightforward way to do it.

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