Tony, My dad use to have a target gauge that I used until he lent it out and never got it back. I don't think you need one though. If you hook up water to the supply pipe and turn it on so you get a strong stream you will see that the stream if adjusted correctly will hit the other side of the pan in the middle of some square spots stamped in the pan. This is where it hit with the target gauge also so I know it is right plus I have set many that way with no come backs. Use a small punch that fits tight in the nozzle to bend it if needed.
