The 2.5 binnacle cost is to install the binnacle on a 2.5 roadster. If you are seeking to upgrade your dash from 2.0 to 2.5 there are several intensive modifications that Tesla, you, or third party must perform... AC duct adjustments are part of that. I asked for a quote from Tesla and have it somewhere... i vaguely recall a 6.5k price tag for 2.5 dash, double din stereo, backup camera, etc.