Remote oil ports. Which is send and which is return??

I used a spin on mount for ATF as the trans in my Dakota was high mileage and very dirty, it was marked. Easy to figure out. Just remove the filter and bump the starter for about 1 second. This by the way, is an excellent way to prime a balky pump, as removing the filter...........the very first thing the pump "sees" removes all head pressure and allows the pump to operate freely

I'm fairly certain the filter goes "in" around the outside and out of the center nipple