Audiofn

I am looking at a pontoon boat with a 200 on it. The owner knows nothing about the thing and records are a little hard to come by. I have a few questions.

The son thought that the boat had about 500 hours, the guage said 270. Is the hour meter on the guage attached to the computer on these or????

How many hours typically do people get with them, are they reliable, anything I should look at, compression check....