I need some advice concerning my factory temp gauge. I have a 57 3100 with a 235. The gauge has never worked properly in the 17 years that I have owned this truck. It doesn't work 99% of the time but every now and then it begins working until I shut down for the day. I have replaced the sending unit with no change. I am just about to have the 235 put back in after a complete overhaul and I would really like this gauage to work. Any ideas? My other gauges work fine. Thanks for any help. You guys are the best.