Originally Posted by al40
I'm still stunned that apparently "waterproof" guages fog up. It's only an issue on my teleflex voltmeter and fuel guage. The engine trim / tacho are absolutely fine. Noticed this on last boat which also had a teleflex voltmeter...... They claim to be fog free as well (I suppose they are if mounted inside).
A lot of instruments are waterproof as fitted - ie mounted and sealed against a console or bulkhead which is 'dry' on the inside.
They may still have holes in the back, usually intended for free air flow which will of course cause fogging in the right conditions. But otherwise, any water vapour caught inside would be difficult to drive out as they warm up.
At least by venting the console, you can reduce moisture building up inside which can only help.
Has anyone tried using sliica packs (or those things people used to have for double glazed windows before vents were installed?)