So I am going to recharge me A/C system using a a/c charger can with a gauge attached to it.

My question is, It says to connect this to the low pressure port. Which one is it?

there is one port on the top, and one lower down closer to the radiator.

thanks in advance.

also, is there anything else that I should take in consideration while doing this?

thanks.

The one on the top.

The high pressure line is the smaller one. Low pressure is the bigger one.

Thank you both