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SORN
by OldSkrote - 31/07/25 02:07 PM
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Aug 24th, 2023
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Joined: Oct 2014
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Blackadder: same observations on my 4/4
Hannes
once: Green M3W; 2013
now: Red 4/4 Sport; 2011
and some practical cars for use in real life
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Joined: Jul 2007
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Member of the Inner Circle
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Member of the Inner Circle
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All my 3 Mogs had dials that misted up usually just the fuel gauge
The Roadster mists in all 4 small gauges in varying degrees.
Peter I don't know if LEDs would help as the gauges themselves also produce heat & they mist up without the lights on
JohnV6
2022 CX Plus Four
2025 MG ZS EV aka Trigger
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Joined: Jan 2015
Posts: 168
L - Learner Plates On
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L - Learner Plates On
Joined: Jan 2015
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I did some research on misted dials and it seems that the combination of older technology (hot wire etc) and incandescent lighting causes the condensation due to the heat inside the gauge.
The modern solution is to use low power electronics and led lighting.
Modifying older gauges to eliminate condensation is difficult, with various schemes such as drilling vent holes, inner glass treatments, hermetically sealing and drying the air with a desiccant, filling with an inert gas all having various degrees of success
I have one gauge which misted frequently so I first tried drilling an extra air vent (fail) and then tried to hermetically seal the gauge (fail).
In the end I tried (as an experiment) using a small 12V aquatic air pump to gently blow air through the gauge. This actually seemed to work.
If the misting comes back this winter I will probably install the pump as a longer term test.
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Joined: Apr 2012
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I think the lights within the dials of the new Plus 8 and the Aero range are permanently on - pretty sure they are. I might try turning the dipper for them right down to zero for daylight running and see if that stops or reduces the 'warm inside/cold outside' issue.
+8 4.8
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Roadster Guru Member of the Inner Circle
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Roadster Guru Member of the Inner Circle
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The air pump is an innovative idea which is tempting.
I suppose the the intake air temp will be critical for this to work effectively, but it's worth considering for winter use, providing the pump noise isn't intrusive.
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Wave & smile... It's a Morgan Member of the Inner Circle
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Wave & smile... It's a Morgan Member of the Inner Circle
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Is it that big a deal ?
It soon goes in my experience
2008 XXVII Platform, Bugatti Blue Roadster 4 Seater
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Joined: Jun 2014
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Wave & smile... It's a Morgan Member of the Inner Circle
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Wave & smile... It's a Morgan Member of the Inner Circle
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Is it that big a deal ?
It soon goes in my experience Sorry I should have mentioned my comment was aimed at the idea of an air pump - it sounds quite a complex solution to a small issue which doesn't seem to affect the driving experience or the functionality of the dials
2008 XXVII Platform, Bugatti Blue Roadster 4 Seater
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Scruffy Oik Member of the Inner Circle
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Scruffy Oik Member of the Inner Circle
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a small issue which doesn't seem to affect the driving experience or the functionality of the dials With you 100% Stewart. The easiest way to solve the 'problem' of dials misting up is to realise it isn't actually a problem at all.
Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 2022 Mini Cooper SE
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Roadster Guru Member of the Inner Circle
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It hasn't been a problem for me in seven years Stuart, but a demister for the gauges would make a nice project. The problem is for the Roadster that would be six gauges, but only three for Bumble - but the big ones hardly ever mist up. The little ones have the mist problem - it must be a function of the air capacity inside.
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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a small issue which doesn't seem to affect the driving experience or the functionality of the dials With you 100% Stewart. The easiest way to solve the 'problem' of dials misting up is to realise it isn't actually a problem at all. Or buy an older mog where it does not seem to happen. 
.+8 Now gone for a 1800 4/4. Duratec in bright yellow.
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