Instead of putting one of those RadioShack LEDs with integrated resistor onto you MK2B bed, I think it's better to put one resistor and two normal LEDs (I use a red and a green one) in opposite direction, as foreseen on the MK2B. This way, the active LED protects the other one from reverse breakdown, while the resistor limits the current through the active LED. As the LED doesn't need to shine brightly, I usually put a 2k or similar resistor, which gives about 5mA current through the active LED with a 12V supply.
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