This is about turning them on or off.
I noticed in options that the speedo and the rpm gauge have to be disabled and enabled together, that means you have both or none of them in your screen.
Since some real life cars have no rpm gauge (for instance my Renault Clio or my previous Opel Corsa) maybe we could be able to control them separately, for instance to only turn the speedo visible.
i think it should be useful to those that want to learn to shift properly just by listening the engine sound or by the car's speed, but can´t stop looking at the rpm gauge, for example.

This option should be facilitated IMO, but personally I'd like to get rid of the speed read out and keep the tachometer.

Quote from ajp71 :

This option should be facilitated IMO, but personally I'd like to get rid of the speed read out and keep the tachometer.

just download analogue guages and edit the script to remove the speedo, thats what i did and i modified the tacho gauge to that of the "stack" family of instruments.

you can find the analogue guages on here somewhere?

So you add another gauge via an overlay or what?