Speedometer calibration might be different due to the taller differential in the 85. But if your current speedo is working, you could swap it into the new cluster in just a couple minutes.

__________________
Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References