Oil pressure gauge - hotwire harness

I have seen guys T off the pressure/temp sender on the front of motor. You could also T off your remote line somewhere.

As long as this is a related thread- the oil ports that you are using for your remote filter. Is the bottom pressure and top return? I have a sender in the bottom port, and a plug in the top. Was thinking I could just put the sender for my dash gauge in the top, then realized that may not work because it wont see pressure if its the return port.