I think I can help with lots of information there, Peter, but perhaps best via personal email if not contact/telephone.
For example, there is a company just over the Dutch/German border who will change the IPK display in your instrument binnacle (if that's what you meant), or do it by post, at Euro 130 fitted, about the same price as the UK or less, without the duty/tax/fees hassle. 5 year guarantee too.
You should be aware that any goods being imported from the UK into the EU are, at least in theory, subject to tax and possibly duty now, whether they are posted or hand-carried (if you can eat them it's not allowed, basically, so rules out importing cases of Marmite to subsidise the trip!). Only gifts from private individuals valued at under about 45 Euro's are free of tax, duty and handling charges, but PostNL ALWAYS charge anyway, and its up to you to try and get it back. So far 100% record, but takes weeks. They even apologise.