New to us Mercury 175 xri (I believe 1995, serial #OG217776). We test drive boat before buying, no issues. Ran on muffs (idle) at home, no issues. Go out to lake on shake down cruise and get constant beeps from buzzer alarm. Beep, beep, beep,...... Fast and right from start up. Eng water pressure guage barely registered, tell-tale had inconsistent water. It has been several years since I have owned an out board.
Could this be an impeller issue?