Installed the 3 GSK which is awesome, but now I have an oil leak by the 7/8 plug nut on the side of the pump. I don't remember seeing an o ring or gasket for it when I removed it, is there supposed to be one?

 

there is a thin one on the plug its self if there is one at all. I have done a few of them one of those was two days ago and I cant remember I have never had one leak thou. I didnt used my forearm torque wrench and it said maybe 10 foot pounds not tight at all really. Hopefully not cross threaded or overtighten.

 

After many GSK instals, I've never seen a gasket or o-ring. The oil is not under pressure in the pump so no real need. As estrada5.9 pointed out, tight, but not too tight. I've never had one leak either.

Being it lacks pressure, a degrease of the surfaces and seal with RTV will work, too.