I'm gonna be doing the same thing on my 190 in the next few days hopefully. I need to replace the oil pressure sending unit as well as the oil level sending unit, and a bunch of other components. Anyone have any clues on how to do that?

I figured that in order to replace the oil pressure sending unti I will have to pull out the entire oil gallery that the filter and pressure unit sit on. It would be the easiest since there is not enough room to get the filter or the unit off or on. I got some gasket paper to make a new gasket for the gallery once it's off. Anyone do it this way before? I'd love some feedback.

Second issue is the oil level sending unit. I know I have to drain some oil, but is there an o-ring there or something? I didn't order one, and if there is, I wanted to know if any o-ring will do, well same size of course, I hope I can find one at a local parts store.

xp