Intsrument Gauges do not like cold weather??

I would first try changing to an electronic "voltage limiter", as most people do. Search that term with "Plymouth" on ebay. About $30 after shipping, at least in the U.S. Fairly simple to swap, and you look like a handy guy. While the dash is out, you might consider changing to LED bulbs like I did. About $1 ea on ebay. They draw much less current and don't generate heat to dis-color the plastic, and should last forever.