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<p>I recently installed DCC in a P2k SD7/9 (mine happens to be a 7).  I used the same decoder as Rich, the NCE D13SRJ.  I threw out the P2k board and the light bulbs.  You should install LEDs or smaller bulbs.  The P2k bulbs will turn your beautiful loco shell into a useless hulk of melted plastic if you take out the factory board. </p>
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