I did just this a few months ago. I bought some 1/4" plate steel from the local home store and cut two identical plates to block off the EGR. One on the exhaust manifold, the other on the intake manifold "inlet". You'll note the small divot on the plate, this is where I plan to drill and tap the EGT probe, it seems like an ideal location. "Jim C." on the Volvo Diesels listserv gave me the idea on where to place the thermocouple.
