i ended up going with the oil sandwich route.. i know people say it increases the chance of a leak but i figure it's the best way down the road when i get the oil cooler..
Defi manual says to use a sandwich adapter..
i guess i do like keeping the stock sensor for double safety measure.. yes yes i know it's just a switch that comes on when there is almost no pressure.. by then i would be f-ed already.. but it might still come to resue when the digital gauge fails..