A word of warning about tiller pilots when the spray is flying. I set out double-handed across the South Atlantic from Rio to Cape Town in 1996, with a tiller pilot as as 3rd crew. I was warned that they are very susceptible to moisture and advised to totally enclose the body in a plastic bag, sealed to the shaft as well. My crew told me that he knew all about these problems and would do the job. I was skipper and did not check his work. It died a few days into the 4 week voyage, after a storm. There was a breather hole in the lower casing, right under the fluxgate compass and he had not sealed it. We ended up hand-steering for 4 weeks, 4 on 4 off. That was 24 years ago, so hopefully they have sorted out these problems by now. I think that mine was an Autohelm but whatever unit you have, if it has a breather hole in the casing, that is a weakness to be aware of for keeping out moisture.
DD