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Just an update. My mechanic has been able to fit all the 4 gauges onto the panel, but the result is poor since the gauges seem to be inserted without order, moreover one of the larger gauges goes out of the white border.
Two of the switches have been displaced toward the bottom, so they must be locked by some glue.
I will eventually post a picture of the panel, as I left my mechanic while he was drilling the smaller holes.
Since Mercury and Boston are in the same group, and the 150Hp is the perfect companion to Montauk, it seems that the two companies do not speak one to the other...