Now I am not claiming to be a techie of any sort,but the CRT displays of the dauphin,with their associated health and safety risks would require replacement(who here has a 16 year old TV).I would also guess that if you are to replace the search radar display on the dauphin,it would be just as easy to replace the entire radar(270deg Omera if I remember rightly).
The Tramore tragedy also identified a weakness in the Auto Pilot(the weakness being AC authorities didnt trust it),this too would probably require replacement,and the current type is linked to the flight controls to allow auto hover for SAR.
As for Analog displays,the Newer replacements for the A3 and Gazelle in Eurocopter's brochure have relatively simple displays,with a combination of digital and analog gauges.
The USCG Dolphins do not have the 5 screen EFIS as seen on the Irish dauphin,instead having an all analog display,similar to that found on the SA365N,with local differences. It will be replaced in their service shortly under the Deepwater programme,possibly with the A109.