Low Oil Warning signal

I have a oil injection system on the 150 merc. I just put two gallons of oil
in. It's working, but every season for some reason this darn thing goes off
and won't quit. The oil tank has two ports, one to pour oil in and one where
it's sucked up. I don't see any other wires. I want to disconnect or try to
find out where the little ballast thang is so I can dislodge it or somthing.
You all know I"m not very mechanical. . . so any advice is appreciated. Hope
there's enough info here. thanks in advance guys an gals.

--
God Bless America

Josh The Bad Bear