Opposite end of the valve block to where your pressure line goes in, not sure what your valve is like but on the vario you have at one end a hole for the feed from the pump then next to that a hole that is for return to the tank, then at the other end you have the same i put my relief valve in there. I think there is a picture in the tech section somewhere of joes valve i will try to find the thread.
Edit: this is the picture i copied my setup from, post 14 by Joe
http://www.rctruckandconstruction.co...ead.php?t=3697