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so yesterday i put a si cluster in to my dx and everything seems to be working ok but there was a extra harness spot that i couldnt find a plug for everything seems to be working ok i was just wondering if that plug was important cause i have no idea wha it goes too can someone help me out plz thanks

 
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I think they use the same back shells at the factory for the automatic and manual transmission versions (and just stick different guts in depending on which car the cluster is going to), and the plug that you're seeing may be where the gear selection indicator goes for an automatic.