I'm 100% in agreement with Jeff, Nathan and the others regarding the clock and all its variations for a genuine vintage Porsche 911. However what are the purist's opinion of this very smart navigator unit made by the Porsche factory and mounted in a classic car ? I must be honest: it doesn't hurt (to my eyes) and could be very helpful. Anyway, much better that these ugly units glued to the windscreen we often see these days !