Search for concorde cockpit photo's and you will see the museum examples.(They remained as built)
Electro-mechanical instruments are still used in lots of older (pre 1990's) airliners and freighters.
Our A300-B4 freighters have the original instrumentation. The NAV kit has been upgraded with GPS based FMCs and some of them have EHSIs fitted.
The reliability of these instruments is not as good as EFIS but the cost of refitting these A/C would be more than they are worth.
Hope this helps.