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Only if you understand what you are observing. ;) Since a fixed-value resistor is used to drop the current down for 12v operation, putting 24v to it will cause more current to flow, thus giving you a brighter light, and (as mentioned) shortening its life. But since the 12v is already way...

Possible? Yes, possible. Theoretically. Easy? No, I don't think so. You'd have to change all of the instruments, too. Think about changing a fuel gauge, for example. And it gets worse. See below. Some can. It depends on the packaging. All LEDs must have the correct resistor in...