oil cooler and accusump fitment

Oil coolers?
i have a new Mocal oil cooler set up ready to fit into mk1 with pinto.
i also have a 3pint accu sump to fit as well.
now i can see 2 possible ways to fit-
1/ plumb the accusump in to the return line near the sandwich plate with 1 way valve in return line as per instructions by accusump, or
2/ install a T piece where my oil pressure switch is on the main oil gallery line is and plumb it in there,
anyone had past experience/ problems
i have a new Mocal oil cooler set up ready to fit into mk1 with pinto.
i also have a 3pint accu sump to fit as well.
now i can see 2 possible ways to fit-
1/ plumb the accusump in to the return line near the sandwich plate with 1 way valve in return line as per instructions by accusump, or
2/ install a T piece where my oil pressure switch is on the main oil gallery line is and plumb it in there,
anyone had past experience/ problems