The casting is different than the ones I modified but the hole to the right is the inlet for the oil. The oil would be under some pressure but nothing major. Examine the casting and that hole closely. You should be able to through drill the hole, with a small bit, to the front side of the casting. At that point you will be able to enlarge it to the proper size to tap for the brake bleeder. You may need to enlarge the cavity in the OMP to permit the flow from your access line through the pump. Check out the other post you had (OMP Options). I posted lots of pictures and more of a description of how to do this modification last night. Good luck.