Did you consider using a combined temp./oil pressure gauge, then fitting the clock in the vacant position to maintain symmetry of the central panel. With the benefit of no modification to the existing dashboard required.
Thank you for asking > the benefit of no modification to the dashboard itself > > was the focus of
how do i get a VDO clock mounted. second
how do get the clock separated from other indicators for quick reference what caused the final layout > there is an additional switch installed for heated windscreen with a timer function which switches automatecally the windscreen heater off after 15 minutes. I kept all the original parts, so … if my son, as the next owner of her, wants to set it back to factory delivery status.. he can simply do so .. it will be then his decision to drill that 52mm hole .. enjoy ..