Yes I did used soldering iron and but I also have a degree in advanced electronic engineering so this was a piece of piss to convert and used to own a car audio shop in USA so the removal of the dash only takes mere min .
Now I'm going to put in custom lights with fiber optics to make my speedo needles light up red , right now they look like there floating in space because my lights are intense blue and the gauges are white faced. pretty bizarre looking for sure. even my Pioneer deck lights are dim blue compared to the dash
oh and mine is only an executurd model