My white supra has 89+ european signals, brand new from toyota, with KevinM signal covers, and I have cool white LEDs from superbrightleds.com
I bought pre 89 euro signals from a member on this board, MartinP, great guy to deal with, I've bought many euro parts off him...
After 1990, gauge clusters received different wiring, mainly due to the airbag indicator, you can see the issues by visiting some of 92NSX's posts. An 89 cluster will swap into a pre 89 car with no issues, as long as its off a car with the same equipment, such as auto, turbo, or TEMS. Also an NA cluster in a turbo car will render the tach useless, and equal the otherway around. And the boost gauge will not work with only the clusters swapped, you also need the boost sender in the engine bay. Well that about answers it all, have fun!
Ps, there are more pics of my cars in my sig links...