165 3 spool hyd valve, 2 for loader 1 for 3ph position

[signweld]

I would like to make a plate to bolt in place of the normal 3 position hyd. selector valve, drilled and tapped for hose fittings over the port holes in casting (and machined to accept the riser tube)
The purpose is to be able to connect a 3 spool remote valve with the third valve operating the 3ph arms (for lift position, not draft control) without the hassel of reaching down to change the selector valve to go between loader and 3ph arms.
Does anyone know which hole is which on the rear end casting?

 

[signweld]

If your interested, It still works well 13 years later.