[stomachmonkey]

Check gauges and a bouncing needle you do immediately think wiring.

Agree most likely just a bad connection.

We all know what havoc bad grounds wreak on 911s.

And FWIW it's been my experience over the last 11 years that the 911 owners here are generally car enthusiasts and the breadth of vehicles owned by us has created a collective of info that is hard to rival even from a dedicated (insert make) forum.

First place I would come with a question about a non P Car.