My Plus Four suffers with this too. I have found that when it's cold all seems well until the sun shines onto the dials then they mist up....I have / do own many motor bikes (brits / Italian / Japanese over many years with very few examples of misted dials in all weather conditions, but despite trying quite hard on some occasions I never really managed to stop the misting on the ones that did...So I haven't even tried to sort it out on the Morgan (just call it character!)
