I went to the local Lotus dealer with the OEM cluster still working and gave me the option to replace cluster with a new one and start at zero mileage with corresponding Lotus paperwork stating the mileage I came in at with no sticker. We decided that it was very possible the original Varta battery was the culprit in the cluster and the rough idle/engine performance issues. The car was bought new and the battery was stone dead at the dealership and was never able to hold a charge well even after using a battery maintainer for 2 weeks. I did not get the new cluster and the original is still working fine. Lotus was very helpfull in this matter.