fogged clocks

[dependencies]

I HAVE carried out a search but without any success honestly...

so my Tacho mists up sometimes which I think means moisture has gotten inside it,
is there a fix which doesn't involve pulling it all apart,


(it looks pretty well put together)

[gizmofixer]

on older brit cars we used a hair dryer or heat gun to 'bake' the moisture out..........

[tshih]

You can stick them inside a vacuum oven and suck the moisture out. I don't know how to prevent the water vapors from going back in (maybe put a bead of silicone sealant around the back?)

[bazar01]

I would flush it with dry nitrogen gas or CO2 or something inert from a gas tank.

[dependencies]

Reckon I can safely use a hairdryer without
melting clocks/gassing myself

[bazar01]

Originally Posted by dependencies

Reckon I can safely use a hairdryer without
melting clocks/gassing myself

Haha, hair dryer is not hot enough to melt/gas yourself.

I would assume that moisture will just change to vapor phase when heated and condense back to moisture when it cools down.
Find a way to flush moisture out by displacement method.

[dependencies]

How does it enter the gauge initially (generally)
not had the clocks out yet to inspect them
so not sure what to look for leak-wise

[bazar01]

Originally Posted by dependencies

How does it enter the gauge initially (generally)
not had the clocks out yet to inspect them
so not sure what to look for leak-wise

I have no idea how moisture enters. I guess thru the rear connections.
I don't have foggy gauges. 95k miles.

[911Rob]

I've heard of drilling a small 1/16" hole in the bottom of the face glass; this allows the air inside the cab and inside the instrument glass to be the same temp; eliminating the condensation.

My 74 did it the odd time; but not to often.

[dependencies]

Often wondered about a vent hole, I suppose I could always try it, ans epoxy it up again, should it not work.