The further I got through covering the dash the more worried I was about that.
I'm about two or three weeks ahead of this thread, I'm trying to make my posts concise and logical so I'm taking my time writing it up.
I've driven about 100km with the new dash in 34degC sunshine, night time and overcast conditions and it's been fine. What wasn't fine was that I broke the clips of the instrument cover/binnacle during the interior tear down, and I drove around for a day without it (like you see in the last pic). The glare coming off the back of those instruments was unbelievable; it was pretty dangerous, so I've reinstalled the broken binnacle whilst waiting for a new one to arrive.
I might hold off putting the new binnacle on until I install a special package that is soon to be on the way from Mr. RevLimiter