John Deere 855 early model power beyond / rear hydraulic

[sampwell]

Hello,
I try to installer rear hydraulic for my 1987 JD 855 for the backhoe.

I find some thread how to install it.
But mine dont have plug at same place for IN/OUT hydraulic and dont find where i need to install the inverter plug.

I just cant add power beyond or someone know where i need to install the inverter plug?

I try this, some oil get out from fiting when i up the 3 point lever but no pressure.

Thanks for your help