Might try to find a quartz movement if your car sits for long periods. I have 2 or 3 clocks that work for my cars. I just had to spray the works with some lubricant to get them to operate as they are supposed to. If you find a spare cheap enough, just swap them out too. I know of about 20 clocks in a junkyard for my spares. They just suck to remove.
Doug
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"...then grease me up woman." Groundskeeper Willie
www.geocities.com/yqtnxnb