I've replaced the 3 secondary gauges in the dash of my 240z and found that there is no issue fitting the gauges. I've never had to replace the tach or speedo so can't comment on those. But how often do they need to be removed?
Be thankful we have a local option, in the US the company that does the same work charges $1,700 USD going by Facebook discussions.
My 240z has been left in the sun and the dashboard was done before the year 2000 (previous owner had it done). I generally like to put a screen in the front window to protect from the sun if left parked outside and the car has been garaged for the past 7 years anyway, but the repair seems very good to me.
Any chance to show off my dash haha.