I realize this is a very old thread, but I felt obliged to provide both an end and a valid solution for anyone else with this issue.
The solution turns out to be very simple, step down transformers. The digital gauges and the analog ones each have dedicated step down transformers. All of the transformers on my instrument panel were bad. A local mechanic recognized it easily and repaired it flawlessly. I don't recall the cost, there was other work being done, but if you take out the IP yourself, the transformers were supposedly available at the local Radio Shack.