I have a new-to-me 1985 boat, with a 1985 90HP Johnson V4 outboard. It needs a new trim sending unit, part number 583358. It was discontinued a couple years ago and I have only found one place that has it, but it is $180 shipped (about double the price it was just a couple years ago before being discontinued).
I've seen there is a part number 583359, and have read most of these are interchangeable with the only major differences between all of these sender units being some have a ground wire (that isn't needed on all). Anyone know about these motors and know for sure?