I forget who suggested it, but the bolt-in dash clock holder is
https://www.ebay.co.uk/itm/Clip-for-1-Stopwatch/123865766407 - I think I needed to use a longer bolt though!
I use the following clock to fit. Really its a watch face but does the job!
https://www.ebay.co.uk/itm/Premium-...sert-movement-for-52mm-hole/292617518167The analog clock I find useful as the tonneau makes the digital miniclock difficult to read (and really I need to be watching the road not studying some tiny dash display!).