[DarthVader]

You need Faraday shielding capability to protect against EMP.

[GingisK]

...and that is accomplished by a wrap-around steel housing. You also need protection for leads that penetrate that housing. That is accomplished with inductors, a spark gap, TVS diodes, and a diode clamp. Most instrumentation that is used outdoors is already EMP hardened. Lightning causes an EMP burst that is just like the one made by high altitude nuclear detonations. We must plan for very near lightning strikes.

People overestimate the EMP threat from nukes; however, the threat comes mainly from unshielded magnetic coils like those in stereo speakers.

In all cases of a nuclear weapon, your distance from the burst controls the harshness of the affects. If the Russians launch everything they have, working electronics will be the least of your worries.