The only issue now is that you have the secondary cluster in your car...accumulating mileage... and now the mileage in your original cluster will always be wrong...even if you reinstall it sometime down the road. So should you ever have to sell the vehicle you will have to disclose that the mileage displayed is not accurate.
I can appreciate the work...and the effort and I too like the needles illuminating all the way from the center like in the LS, but its absolutely not worth placing the stigma on the car of not having an accurate mileage readout. That might even make the car unsellable...
You couldn't install these needles on your cluster?