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Guage Fogging

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When I was cleaning any waxing the boat getting ready for summer, I noticed a bit of fogging in the speedo. I remember on the old site someone talking about drilling some holes in the back of the gauges to alleviate this problem.

Anybody remember that process, and if so could you post it here for the benefit of myself and those that may have a similar problem.


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It was as simple as you just said. The holes should be located at the bottom of the gauge. I wouldn't drill anything bigger than 1/8" however.

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THE BACK!!! Remove the bezel and then the guage. Then drill a small hole (max 1/8") in the bottom of the guage back. You need the hole to let the moisture and temp in the air to equalize with the air in the guage itself. Drill it in the bottom making sure not to go in farther than the tip of the drill bit so you won't hit any of the parts inside the guage. GO SLOW...

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Just do as ronnie said, but also watch the gauge face, make sure it is on a tower or something. I have seen people crack and scrach their gauges by laying them on work benches. I have also had a friend who drilled through the back and the middle as well so you could see the hole. You don't have to go that far.

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I hadn't seen that thread before.

My gauges also will fog up sometimes. I had been worried that there was something wrong, so glad to find that there isn't anything to really worry about. I have plenty of other things to worry about. It does clear eventually and doesn't seem to affect the instruments. So if I read this correctly there is no harm to the gauges if I don't drill a little hole at the 5 o'clock position etc.? If not, I can live with it, just like I live with the fuel tank gauge.

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