I am a first time boat owner:<br /><br />I have a 1995 Johnson 112 SPL. I was out in my boat, the first time since my test run. I was running at speed when my warning horn came on and when I looked at my tachometer it wasn't registering. I shut down the engine and after a few minutes I was able to run normally with the tach operating. Any ideas on what the problem could be? Is this something that an amature can fix?<br /><br />Now the stupid question: I have heard that there is some kind of tester, similar to the ones used to check coolant or batteries, to double check your oil/gas mixture. Have you heard of this? If so is it reliable? After hearing some horror stories of people messing up on their oil/gas mixtures, I wanted to be safe.<br /><br />Thanks,<br /><br />John