Tach and MPG Gauge were intermittant and now inop. I pulled the cluster after buying the 1.2 Ni-Cads and an external battery holder as the archives suggested. Once I got it all apart, I found two 3 volt batteries. I didn't want to tear it apart much more, so I put it all together and the tach and MPG gauge are still inop. The batteries both measured 3.1 volts or better. Suggestions or can I replace the back board that the batteries are plugged into?