I don't know what it's like in finland but I do (or did) know what it's like in Germany where you could not go in to halfords and buy something like a generic bootlid spoiler. Simply didn't exist. If you own a z3 and if you buy an accessory for it then that accessory was made, and tested and come with a certificate from the OEM and/or by TUV or DEKRA certifying that said accessiry is compatible with that vehicle. In the case of a spoiler the certificate even includes wind tunnel tests results proving that the accessory doesn't have a detrimental affect on the vehicle.I don't know the requirements of the MOT in Finland.....but remember no-one can 'test' an airbag. They are a 'one use only' product. They can only rely on the lights going out to prove the SRS system doesn't have any faults, which then presumes the system is operating correctly.
That can be very easily overcome with a cheap timer for the light!
Why do the original gauges need to be in place? Surely any gauges which give the correct information would suffice.
In the UK the 'rules are the rules' apply to everything, but we can get through an MOT easily with airbags removed and any gauges you like (as long as the MOT inspector can tick the right boxes on his sheet).
On something like a dashboard. Their theory is that the car manufacturer smashed a load of cars into walls with crash test dummies. You change your dashboard and the car is no longer the same as the one that was originally tested by smashing Olaf, the crash test dummy's, face into it.
Also the tester is allowed to use his/her brain. He/she doesn't just look at a LED. They can look at a steering wheel and see that it isn't the one the car was made with and that there's no airbag behind that tiny ferrari logo in the centre of the wheel.
I don't understand how anyone in germany could every do a rebody without jumping through so many hoops that would make it non viable.
But, as I said, I have no idea what it's like in finland.
Personally I find it weird that here in the UK we can do these things having lived most of my driving life in a country where I couldn't even put different size tyres on my car without going for a TUV inspection to confirm that the new size was authorized by the vehicle OEM and entered, bynTUV, into the vehicle log book.