Anyone ever fitted d1 spec gauges?

[Boosted EK9]

Hi I have been looking into getting 2 gauges to be mounted in a twin gauge 52mm speedo surround, for my turbo b series.

In my opinion the 2 most important gauges would be boost and oil temperature.

I like the d1 spec 52mm gauges but they look quite complicated to fit.
I'm no electrician but how easy will they be to fit?

Any info would be appreciated

Thanks Simon