I just purchased a '81 H37C. An A/P was not advertised but I found a Navico WP4000 in one of the lockers. Hooked it up and it powers up fine. But when I press the SET/AUTO button, nothing happens, just stays in MAN. I have never used this type of auto pilot but it seems pretty straight forward in the operators manual. Am I doing something wrong or is it broke? Is it worth getting fixed? Who do you recommend? Mark