Just put my Striker back on the road after a few weeks hibernation and I was getting a few glitches on my speedo and tacho.

The simple fix was to insert the isolater key and turn it a few times and Hey Presto! the Gremlins went away.

So the contacts must have been oxidised enough to disrupt the gauges but not enough to stop the car starting and driving fine!

Might just save you pulling your wiring loom apart looking for a bad connection! I almost did