Will this work with my Eberspacher D4 airtronic? It does say H-kit on the info plate. If so will it be plug straight in or would there be any work involved regarding plugs?

Hello. Yes, this will work with H Kit compliant D4 Airtronic heaters. It is very likely that you will require to change electrical connector plugs and terminals though these are included with the controller. We suggest you will need to have a pair of terminal crimping pliers and be comfortable with such work, but it is not overly complicated. Thank you