Thanks everyone - the picture that Tom posted of the gearchange indicator is excellent and will be fine for the project. Thinking about the vacuum economy gauges and similar, it reminded me of some 1960s/70s Smiths speedos which were marked with extra dots at the speeds when you 'should' change gear...

Thanks Pete, It's not urgent - any picture would be very much appreciated! Just found a couple of good pictures of the vacuum economy gauge on the forum as you say - this too is certainly relevant to the project; it's interesting that Volvo offered both kinds of aids to economy driving. Vacuum gauge...

Hi, My dad had a 360 GL for many years, indeed, I learned to drive in it, and I vividly remember the gearchange indicator light on the dashboard, which (I assume) came on at a certain RPM to suggest that it was time to change gear (from a fuel economy point of view). It always struck me as a good id...