Bill – attached is a pic from my current ‘10 1860 Angler. My previous 620, 619, 618 and other 1860 configuration was similar. Intake to pump (#1) then outage port runs to valve body then front or rear live well (#2).
Hope this helps. Not familiar with the “connector that runs back under the oil tank” as you describe above.
Both in and out ports are as this picture shows, from my limited experience.
Attachments:
EE17396F-3571-46C2-BF99-8D54B59CFC9D.jpeg