I have a '90 Chaparral w/ 305 Mercruiser. It has a trim gauge that says down but you have to trim further to go all the way down, then the gauge jumps to up. I usually just gauge where im trimmed by ear. You hear it go under pressure when ur all the way down. But for some reason w/ this one it never binds and makes that noise. It seems to go down then come backup. Its hard to find that sweet spot that way. Is there a sensor or something I can replace?