No you dont have to disconnect the battery just to pull out the instrument cluster, if I understand you correctly, all you are going to do is use the silver rings from the 330 cluster, when you slap it back in your clock will have to be reset and thats it. Dont know what this crap about having to have bmw reprogram it is. I've taken mine out of my 00 323 about 10 times for different things and just put back in and set clock. Same with my new 03 i've had it out 3 times and just put it back in and set clock.
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