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I own an older merc 188, lately I also have been seeing a drop in RPM, I really do not no at what RMP I should be running at but I seem to think it was around 4000. I can only get about 3200 now and when I throttle it right up the vacuum gauge drops off. Should this gauge if it is working proper...
I own an older merc 188, lately I also have been seeing a drop in RPM, I really do not no at what RMP I should be running at but I seem to think it was around 4000. I can only get about 3200 now and when I throttle it right up the vacuum gauge drops off. Should this gauge if it is working proper...
