erractic rev counter

[t5psr]

When it's frosty/cold in the morning, My rev counter tends to do strange things, first it don't work then it starts to flicker at about 2k revs. No matter what revs the engine is at. Then minutes later it will be well past the limiter even when idling in traffic. It's as if it's got a mind of it's own as soon as the tempratures start to rise it eventually settles down and is in perfect harmony with my right hoof. it's definetly related to cold/damp conditions . any Idea?? does it sound like an exposed wire etc??

[Brianmoooore]

If the SI board in the cluster has NiCd batteries, then I would suspect these.
Take the board out, measure the battery voltage, stick it in the freezer for half an hour, and measure the battery voltage again.
I've seen them give normal voltage at room temp, but drop to zero when cold.