Fuel Gauge wiring (rewiring to fuel cell)

So, my question is basically whether I should tie these wires on my fuel cell (theyre for the built in level sender) into the blue (wiring diagram I pulled up said that it was for the gas gauge, and if it would work... Or should I get the corresponding female piece for whats on the wires for the fuel cell, tie that into the blue with a ground, and plug it in.

Now, IF tieing it into the wire will work, I know I SHOULD get the female connector, but at this point its about 'what will work at the moment' for me.

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