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What do you mean how does it work? You send your cluster, they replace the bulbs with leds. But beware, mine started to go out after 3-4 years. Did it again myself
Went a different route and soldered in two side firing led strips (72 Leds total). Not hard at all and works like a charm. Might open it again to correct some minor darker spots when I get bored. Not trying to stear you away from Lextech, turned out really well (especially the smd needles which you can't really do yourself). Just was a bit disappointed that it didn't last longer. Luckily the needles still work, knock on wood.