Originally Posted by Army

The .315 I have in my garage is mechanical

I'd like to have the confidence to say that all 722.315s are with mechanical speedos but after I learnt that the 722.118 has a throttle linkage for cars pre-1979ish with no vacuum modulator but post 1979ish they've got no throttle linkage and are vacuum only...

...Mercedes transmission naming / numbering conventions seem to be "whatever they felt like at the time"! Anything could happen - they could all be purple and come from Mars...