Sorry guys - I should have clarified. The fitting going into the block is tight. We put it on first and got a socket on it with an extension. It was easy (just like when we had the oil pressure gauge there). The problem is the 30 degree fitting with the hose attached that needs to fit into the one going into the block. Since the hose is on one end, we can't get a socket on it, so we have to use a wrench. Our crows foot tool should be here tomorrow, so we will try it and report back.