Generally speaking. Whenever I replace analog gauges I try to replace them as a set. Gauge,sender. Most of the failures I see are sender's (VDO) going bad. I would go over your grounds on the engine if you're run into more problems. I good meter that you can check resistance with would help determine what wires are having connection issues. Also don't be afraid to cut the terminal off the end strip it back a little to see if it has any corrosion in the jacket.
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