I have a 1988 40 hp Johnson with trim and tilt the kind that mounts outside of frame and brackets to motor I am not sure how this type of unit works I have not installed since haveing cyl rebuilt. It have test run the right cyl goes up and down which is called the tilt cyl the other cyl does not move it has hydro line going into bottom feed line but no return port can anyone tell me how this unit is supposed to work ThanksGot it; thanks to all.