I have the same issue with mine. I bought it as a none running project. I got most of the broken issues dealt with but got the same problem you have. I checked the wiring diagrams and found they all go to the cluster. I openned it up and found a chip blown off the board. Sent it to a speedo cluster repairman and got it working again.
But it did fail again shortly afterwards. Chip still mounted to the board. So it seems to me a cluster issue or a short.
But it did fail again shortly afterwards. Chip still mounted to the board. So it seems to me a cluster issue or a short.