RC 8 - Nano, where do I wire my flowmeter signal pin

I have just finished constructing @SK21 's rc_8 Nano pcb and enclose. I was wiring up and realized I don’t know where to put the signal wire. I’ve taken a picture of the blank PCB for reference.

On the top right it says Rt1 and Rt2. Either of those two will work. If using an ethernet shield it is easier to use Rt2.

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